Ive started to make spawn in 2005, and at first I had a glovebox that I used for a while with medium results. Blower is housed in a 2' square box with 12" air intake filter. Or just Velcro the filter over the intake of the fan, filter-cage side backwards to avoid turning your fan into a shredder. Depending on its design, a horizontal flow hood provides protection . fluid dynamics - Air Turbulence and DIY laminar flow hoods - Physics So a flow hood IN CONJUNCTION with sterile technique is the best way to go! I have some plans but they are for a 24 x 48 and the fan is like $1000 or something and filter $300. Im having scarce 80 CFM after the filtration. Have you worked with horizontal laminar flow(clean air comes from up the bench)? And also, is that blower a 110 or 220? Definitely more sufficient. Hi , did you use a grill to protect the hepa filter? hi! For my blower, the most it will pull is 3.0 Amps at 115 Volts- which if run for 1 hour is equal to 0.345 kWh. It is generally installed at the intake of the blower fan. Using the above blower, what is the effective distance from the filter you can work contaminant free? You can never overthink, but having side walls and a roof is not at all necessary, and actual makes the mycological work quite cumbersome. Ive been always convinced that I need to come up with something better than what the market has to offer. 2. MaterialsTop and Bottom : Two 25.5"x12" Plywood 3/4" ThickSides : Two 13"x12" Plywood 3/4" ThickBack : One 25.5"x13.5 Plywood 3/4" ThickHepa Filter : https:. If so, you may just be a little mystified which is totally understandable. This post was fascinating and it seemed to cover every aspect of the science behind laminar flow! Hey there! We now need to match the filters requirement with a fan, however, we cant just find a fan that puts out 341 m3/h as we havent factored in the filters resistance, an optional pre-filters resistance, as well as an ageing margin. Like I said, it wont be able to deliver the 100 ft/min speed of air, but it will be very close, and is likely the best option of the Dayton fans for the filter that you have. This tells us is at that pressure resistance of 80Pa the fan will put out approximately 600 m3/h, nearly double what we require. And the rear of it is even dustier. The Dayton 1TDT8 would probably be a better bet, although it cant quite produce the 400 CFM at the resistance of the filter, it comes close and should have the air moving at about 80 ft/min, which will likely be enough, and it is also easier to mount. Find out more about me. Thanks, James. The whole world of mycology is so fascinating and I am so grateful to come across this post! There are cheaper HEPA filters, such as the once available for home furnaces but dont get these. Something to share from the past I grew Roooms back in the 70s and built a plywood inoculation chamber box, painted and sealed inside, two holes below a slanted glass window, with long rubber gloves attached to the box. When you make your joints, dado or but-joints, pre-drill the material with an undersized pilot hole before driving self-tapping screws in. I made my own speed controller with an old dimmer switch and junction box I had. Hope that helps! While you get through the info write down questions and put up a list then submit that to the support center and Ill get back to you ASAP. Yes, you shouldnt expect a large force of air, barely noticeable when you are working. The typical laminar flow cabinet consists of three parts: The idea is to provide a smooth and constant flow of clean air over a workbench. If they are laminar than they are probably good, I would say 8 cm is plenty deep. I will stick to Still air boxs for now, LOL. Best bet is to hold a lighter in front of the hood once its built and see what the range of laminar flow is. If you are inoculating a lot of spawn bags, you may want to consider the larger 24 x 24 which will offer you more room to work. Hey Phin! Is there a pre-filter between that cut square and the blower? 24 x 24 would be a little bit nicer though in my opinion, but if you can find a 21 x 21 they are definitely adequate. In a vertical type, the air is blown from the top over the working area and moves out through the base A good way to check it to hold a lighter or small flame in the air stream. For this build, I used a 24" x 48" Astrocel 1 Filter and a Dayton 1TDU2. November 22, 2019 LabOnTheCheap DIY You can make your own portable laminar flow hood from a Vacuum Cleaner, some plexiglass, and a HEPA Filter. Thanks in advance. In the UK, I recommend Jasun, I've used them many times and their quality and customer service are on point. How to Build a Laminar Flow Hood. BOOM! The volume of air that a particular fan can provide at a given static pressure can be shown in a performance curve which is usually provided by the manufacturer. A laminar flow hood is used to create a dust-free zone of air. I will be making a laminar flow bench this weekend, I like your design. What filter and fan are you using for your personal flow hood Tony? video presentation: 53 minutes instructional videos: 37 minutes Q&A Support 0 Created by: Dan Tura Last updated: 1/2022 CONTENT: non-downloadable LEVEL: beginner $75 ENROLL NOW My Story on building clean air flow-hoods Without a doubt, the absolute best choice when buying a flow hood is the wonderful folks atFungi Perfecti. I was looking to spend a fraction of that to build mine. Is it mounted ahead of the fan, or just ahead of the HEPA filter? clean the filter? Amateur mycology has really ruined terminology this is not a laminar flow Hood it is a positive Airway that is HEPA filter which may work but it is not a laminar flow Hood. Forums. Even if someone made a kit that only included the basic box, wherein one could then purchase the filter, motor separately. You say deep seated HEPA filter, otherwise no laminar flow will be produced. In the UK, I recommendJasun, Ive used them many times and their quality and customer service are on point. The first is to take the filter to a carpenter and ask them to build you one, giving clear instructions on the requirements. Thanks for pointing out this discrepancy- in my experience, the 99.97% filters are absolutely fine for small scale cultivation- they work tremendously well. If the latter, then an inexpensive furnace filter the same dimensions as the HEPA should work well, I would think. Be sure to check it out! Thicker corrugated sections equate to better laminar flow at the cost of more resistance. You may still have many years of use out of the HEPA, but you may have to replace it. How To Design And Build A Laminar Flow Hood: Part 2 - Build Thx in advance. From the front of my wood to the back stop is 97.8mm. What is it? Thanks for the great article I was going back and forth on forums, this was actually very informative and it cleared a lot of questions. I need all the help I can get from you before I make a purchase. With a pre-filter what do I need to change? Laminar Flow Hood | Thermo Fisher Scientific - US So for years on the mycology, plant tissue culture, and DIY laboratory websites there has been this ongoing debate on how to achieve laminar flow in a home built laminar flow hood. I followed your YouTube channel and I have read most of what youve written here on your site. Thank you for this in depth description on the specs and details about how and why a flow hood works! Hi I have built a nice laminar flow hood using a filter of approx 60cm x 30cm that I aquired from ebay. Bonsai This is my top Laminar Floor Hood for Mushrooms on the market. Here is the flow curve for the TDT8: NIce article , iam from Brazil and i am doing my laminar flow hood. DIY LAMINAR FLOW HOOD PLANS DIY LAMINAR FLOW HOOD PLANS PG 2 This document outlines the build plans for a 2' x 4' Laminar Flow Hood, including required materials and tools, as well as a step by step guide to assembling the cabinet. The information for both the efficiency and the static pressure of the filter should be provided by the manufacturer. Hey Josh! John. 0:00 / 11:36 How To Design And Build A Laminar Flow Hood: Part 2 - Build FreshCap Mushrooms 348K subscribers 181K views 4 years ago GET FULL BUILD PLANS:. DIY Flow hood: Ideal FPM #27695745 - 03/14/22 10:45 PM (1 year, 2 months ago) Hey Everyone, Don't want to beat a dead horse, I know there are a ton of posts/threads about this (partially the problem). This shows the importance of having a pre-filter, which will clean the air before it even reaches your HEPA, keeping the pressure drop lower for a longer period of time. Perfect test! The wood I chose was a 12mm high quality plywood. It doesnt doesnt make it any harder to remove the filter when you need to change it. I want to start a mycelium production here in Namibia, but at a low cost investment for starter. Fans move air in volume not velocity, so we need to work out what volume of air we want to move per unit of time in order to meet the velocity requirement, so, we need to do some maths to match our filter and fan. I just want. To continue the example, lets say that the HEPA filter has a static pressure of 0.8 and the pre-filter has a static pressure of 0.2, giving a total static pressure of 1.0. Use silicon to seal the edges, especially between the inside of the box and the filter. Could you give more detail on where to apply silicone between the filter and inside of the box? Thanks for all the time you put into answering our stupid questions. A great guide to show you how to build your own flowhood, Investment into materials: up to $70 (the cheap version), more efficient (compared to conventional ones), Mushroom passionate people wanting to grow mushrooms at home and considering to become independent from spawn producers, Mushroom farm owners interested to make their own spawn or to build their own culture library, Entrepreneurs wanting to launch a mushroom spawn business, Those that care about their own health and who want to switch from fiberglass filters to non-fiberglass, Those interested in fungal material projects (structural composites), Those interested in orchid growing or electronics, Those who want to keep purchasing their spawn from other companies, Those that own a HEPA filter based flowhood and are not interested in swithcing to a non-fiberglass flowhood. This will be a great addition for you if youre on a low budget but want to make your own spawn, have your own culture library or perform mycology experiments or develop new interesting products for the market, If youre constantly worried about fiberglass particles in general, this is going to be a great change so you can work without thinking about the possible health hazards that conventional HEPA filter containing flow-hoods can cause. If you want to build a smaller filter, you can choose toget a 12 x 12 HEPA filter, which may be adequate- albeit just barely- for small scale home cultivation. Home. It will be helpful to allow the flow hood to run for some time before use as it will clear the filter of any contaminants that landed on the outside and will scrub the air in the room. Still with-in the chamber, I added the inoculum to approximately 1/4 c. of rye grains in quart jars that had been previously steam sterilized and a few more days the inside of the jars were totally covered in mycelium. Worth a try though! For the 24 x 48 I used the Dayton 1TDU2- works awesome! I am having some difficulty finding a filter that fits all of the above criteria. My question is, what is the next size up blower from the 1tdt8 that will put out around 350cfm at 1.2 static pressure ? + Lesson 1 Flow-hood types: advantages and dis-advantages, + Lesson 2 Filters & blowers: what to pick and why, + Lesson 3 Matching the filter size to a blower: airflow calculus, + Lesson 4 Ways to check flow-hood efficiency, 2 Details On How To Build The Flowhoods, + Lesson 1 Building a $55 fan-filter unit, + Lesson 3 On how to build a simple plywood flow-hood, 3 Details On How To Build A Recycled Clean Air Flowhood, + Lesson 1 Flow-hood structure and air currents dynamics, + Lesson 3 Details on how to build this type of flow-hood. You ideally will build a hood with a HEPA filter that is 99.99% or more efficient. I hope that makes sense. I want some room above the bags. So, in order to achieve the velocity, the fan must be able to provide 341 m3/h with the 80Pa of resistance. I would like to know more about building my own flow hood. Hi Tony, I built a 24 x 48 flow hood using your instructions and the same blower and filter. I have spent more time, money, and resources than I am going to admit on getting the box right. I will share some of @SCJedi (hope you don't mind me. Perhaps you can find someone locally that could assemble it for you? Become a VIP for discounts, giveaways and more. Thank you. A thorough article on instructables walks you through the process. I could send them to you of you like, just send me a note on the contact page. Tying to build a laminar flow hood : mycology It's a fungi.com 24" x 24" aluminum framed HEPA filter 5 7/8" deep. or am I just overthinking now? I used the information to make a design of my own using similar materials for about $80 and have had ZERO contaminants on my first three sessions pouring Petrie dishes and innoculating them! Glad you found it valuable . Go. Either way, the dayton 1tdt8 does not look like it can achieve even 300cfm at 1.2 static. so i will also stick to 150mm to be sure? I do have a question though, Is this tough on the electric bill? Ive used this fan for 2 of my flowhoods and theyre very good, however, you can use any fan as long as it provides the required flow at that resistance. Curious about the pre-filter. You can use lower efficiency filters but there is a negligible cost saving and a higher probability of contamination. What I used to do was bring in air from another room, and filter it before it came in. In 2017 I built my forth flowhood. Hello; Thank you for this wonderful page and i am sorry about my poor english. Any suggestions with size, brand of filter and . Thanks for this amazing resource of info by the way! Hope that helps! This was a simple cardboard made flowhood and costed about $70 to make. Dr Turas Online class really helped me round out my knowledge of basic mushroom cultivation. I mean as far as I know I would only have the flow hood on for a maximum of up to an hour. The flame should be bent over at a relatively constant angle within the entire stream of air flow. I trust that yours must perform well. With the filter out it blows like a hurricane. These fans are rated based on the volume of air that they produce at zero static pressure in cubic feet per minute (CFM). The flow can be horizontal, blowing parallel to the work surface, or it can be vertical, blowing from the top of the cabinet onto the work surface. Thank you very much for your effort and for this excellent article. I did not use any type of filter system. I had the same question, but Im slightly confused. Sure, as long as you have the air flowing into the plenum at the right pressure it should work . The work room/area will be quite small and I am planning to put a curtain to separate it from the stairs behind. This pre-filter will have a static pressure of 0.1 to 0.2, making the total static pressure of the filter system somewhere between 1.0 and 1.2. For this guide, well use metric. Do you know if the exhausting fan must be on the box. 00:00 Intro. Thanks for the course, it really helped a lot. Hi. There are 2 options: 1- Filter 5sqft , need 500cfm , and my exhaust fan Reaches perfect 494CFM in 1.0 static pressure of my filter. Construct your own equipment. Shop our Ultimate Mushroom Complex. Hey Jeff! Then measure the internal size of the fan output and the outer lip of the fan. How To Build A DIY Laminar Flowhood For Mushroom Growing These FFUs will soon be available in my store, you can see mypost here where you can sign up to an email listand be notified when they become available! as you mentiont in the reply, a 30mm filter would require a stronger blower. Sounds like that filter has definitely had some use! I have purchased a Koch biomax HEPA filter with the following dimensions- 24x24x11.5 with the following specifications: capacity- 1050 cfm Initial pressure drop- 1.0 w.g. What do you suggest me to have lower temperature? What kind of way should I follow? You can seal with silicone or aluminium tape along all the internal joints and secure the fan by aligning the hole on-top with the fan outlet, marking up the 4 lip-holes and drilling. You can usecut-to-fit vent filtersto customize the pre-filter to the size you need. The area of your filter is 8 sqft, so just as you calculated, you need a fan that provide at least 800 CFM- at the static pressure of the filter. This is actually quite a lot of static pressure and requires an adequately sized fan in order to provide a sufficient stream of clean air over your work area. So here I am ready to share this with you. It also keeps the room under positive pressure, so that it protects the entrances from introducing contamination. I must make one for my new room to save space on the bench, what do you think? You can really just tape in on the outside I dont have a picture right now, but whatever method you use to make sure air first passes through the pre-filter will work. I think a 5-7/8 filter will be just fine, as long as it meets the minimum criteria you want for filtering contaminants. They are fast to colonize, produce a ton of fruits and arent at all afraid of less than perfect conditions. Your work space will be kept 99.99% sterile. There are no reviews yet. How To Design and Build A Laminar Flow Hood: Part 1 - Design This hood was designed to aid in simple grain to grain transfer and agar work. Did I miss something? Or this24 x 24,by Filtration Group is also good choice. #1 Discuss.im pondering for the future GCG CHOOSE YOUR TITLE May 9, 2020 #2 I made my own sort of flow hood. Parts are ordered. This is deemed sufficient for mycological use too. A High Efficiency Particulate Air filter (HEPA filter) and pre-filter. Thank you! Always use proper techniques like trying to keep your hands downstream of the cultures, plates or grain jars that you are opening. If you are wanting to include a pre-filter, you would need to look at the spec sheet of that pre-filter to find the resistance and add that to the HEPAs resistance and re-draw your line on the Airflow Curve chart. I have done this before in a small lab and it works well! This is the same as the 12 AstroCel 1. Thank YOU for reading! Or would I have to consider another blower? Which blower do you use in youre 24 x 48 flow hood? These hoods can be made relatively easy if you have the right tools. Hey Shawn! However, the majority in mushroom growing are homemade from HEPA filters, centrifugal fans, and wooden boxes. Because it was like a closet I could make plenty of spawn with it for my mushroom grow projects. As usual, any questions, feel free to email me or comment below! From the photo of your set up, I am guessing you cut a square that matches the fan to blow air into the box. Thanks for reaching out, your english seems fine to me! Flow hood link! A good material for the box is finished plywood, at least 5/8 thick and strong enough to withstand the vibrations caused by the fan. 3. In terms of physical size, I would select the biggest one you can afford, just bear in mind that you will need to budget for a fan and case to match. You could use a glove box with a pretty high rate of success, but anyone who wants to get serious about growing mushrooms needs to consider using a laminar flow bench. No inoculating chamber? There are alsoAdd Filtration, another UK based company Ive heard good things about. This article was very important to me. I do have some more pictures of the assembly, which I will get up on this article soon. Laminar flow hood plans #9877059 - 02/27/09 01:15 PM (14 years, 2 months ago) Log in to view attachment Work is slow and I have some time on my hands so i have decided to program some hoods. No I have not tried to use a radiator fan or computer fan. Please send me a copy. 99.99% efficiency at 0.3 micron is usually a good bet. Choosing the 700 m3/h fan line, we draw a straight line from the approximate location of your resistance until it hits the curved line, then draw straight down.
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