knifemaker3 Posted June 14, 2011 Report Share Posted June 14, 2011 Guys, I've been contimplating putting in a vent hood in the back of the store to allow me to pour plastics while at work instead of at home at night. Customers do come in everyday plus I have neighbors in the strip mall where my shop is located. What would be the recommended cfm for a vent hood to get the fumes and smell outside? Or should I just forget about it and keep pouring at home of an evening? Thanks Craig Quote Link to comment Share on other sites More sharing options...
jwfflipper Posted June 14, 2011 Report Share Posted June 14, 2011 Guys, I've been contimplating putting in a vent hood in the back of the store to allow me to pour plastics while at work instead of at home at night. Customers do come in everyday plus I have neighbors in the strip mall where my shop is located. What would be the recommended cfm for a vent hood to get the fumes and smell outside? Or should I just forget about it and keep pouring at home of an evening? Thanks Craig First of all you would have to make sure it was allowed by code and if there would be any restrictions at the mall Quote Link to comment Share on other sites More sharing options...
knifemaker3 Posted June 14, 2011 Author Report Share Posted June 14, 2011 (edited) First of all you would have to make sure it was allowed by code and if there would be any restrictions at the mall Not a problem where I am at. I already run a screenprinting operation in my location as well as the hunting/fishing retail store. My town is easy to work with on zoning issues and codes. And the owner of the strip mall is very easy to get along with. Basically tell me to do whatever I want. I'm just concerned with getting it out of the building so the customers don't complain about the smell. Edited June 14, 2011 by knifemaker3 Quote Link to comment Share on other sites More sharing options...
powerworm Posted June 15, 2011 Report Share Posted June 15, 2011 as a rule of thumb is 100 cfm for every square foot of opening so lets say your vent hood is 18x24 thats 1.5x2 =3 square feet so 300 cfm would be your number and dont think that oh 22o cfm thats close enough always go bigger not smaller. you are wanting to rid the area of smells and your typical range hood at home is in the mid 100's and you walk in the door and you smell whats cooking right? but if you measure that hood you are probably going to need at least 500 cfm to do an adequate job!! Quote Link to comment Share on other sites More sharing options...
Pitbull Baits Posted June 15, 2011 Report Share Posted June 15, 2011 (edited) Call a HAVC company to have it done right. Most of the time they will tell you what to do. I work for a HAVC company and have a half ass idea lol. You may have to bring in fresh air in. Otherwise you could just be wasting your time. If no air is coming in prolly no air going out. To much CFM and your pulling the heat or cooling out and going to run your bills up. Not enough CFM and nothing will get pulled out. Your also going to need to figure out what type of hood to get for the outside. Best thing to do is hard pipe it outside. Cost a little more but worth it. The flex hose will get liquid build up in it and sit there if its no straight up and down. With some of the crap in that smoke could cause it to rot out faster then normal. You also have to figure in room size and some kitchen range hoods are not vented out. Kitchen range hoods are more for removing steam then smell. If your cooking something that stinks like crap prolly shouldn't be cooking it. The vented range hood are usally vented with 3 1/4 x 10 duct work. You can get a 3 1/4 x 10 register boot that 90's up. Then you can run round pipe outside. Your also going to need to figure out what size pipe to run also. If you go to big you will have not suck anything out. Like I said at the top call a HAVC company. They do this all the time. Its the best way to go so your store doesn't smell like your making plastics in it or something lol. Edited June 15, 2011 by Pitbull Baits Quote Link to comment Share on other sites More sharing options...
EdL Posted June 15, 2011 Report Share Posted June 15, 2011 Do an internet search on Spray Booth Design And Fan Selection Several article on design considerations for setting up spray booth - fan size, air velocity, duct size and lengths. Should help you with a setup. Quote Link to comment Share on other sites More sharing options...
Musky Glenn Posted June 15, 2011 Report Share Posted June 15, 2011 I agree with Pitbull, room size has to be a consideration as to how many cfm of fan size needed. Musky Glenn Quote Link to comment Share on other sites More sharing options...
powerworm Posted June 15, 2011 Report Share Posted June 15, 2011 i agree a professional is the way to go thats why i was quoting one i trust from another site. he has been doing hvac and sheet metal work for over 30 years and those were the numbers he gave me when i started and i have continued to pass on that useful information. and by the way most range hoods do vent outside to avoid moisture build up in the kitchen; the ones you see that vent right back out of the top of them are for where most kitchens either didnt have one originally or were not designed for the venting need ed for one also. another thing to consider is the longer the run to get the smell to exhaust you will need more cfm!! Quote Link to comment Share on other sites More sharing options...
knifemaker3 Posted June 15, 2011 Author Report Share Posted June 15, 2011 Thanks for all the great info! I'll call my HVAC guy. Need to anyways to vent out the future purchase of a conveyor dryer for the screenprinting side of the business......maybe I can get both in one! Craig Quote Link to comment Share on other sites More sharing options...
