Small Warehouse Ventilation Requirements
Small Warehouse Ventilation Requirements
(OP)
I am trying to find out the ventilation requirements for a small warehouse made up of a 1500 s.f. main area and four smaller 500 s.f. areas. The smaller areas are separated by 2-hour fire walls. The ceiling height for all the spaces is 20 ft. There is no hazardous storage in any of the areas. There is only heating (electric unit heaters) in these spaces.
I do not have a copy of ACGIH's Industrial Ventilation Manual. If anyone could help me out I would appreciate it.
I do not have a copy of ACGIH's Industrial Ventilation Manual. If anyone could help me out I would appreciate it.





RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
your area: 1500+(4*500)=3500 sq.ft
Ashrae rate: 3500*0.06 = 210 cfm
210*60= 12600 cubic feet per hour
12600*(3500*20)= 0.18 air change per hour
it is ok for this kind of building
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
You are mixing between outside air requirement as mentioned in ASHRAE 62.
(0.06 cfm/sq.ft) and the total cfm running in duct system,
Greenheck table suggest the cfm rate in your duct system not the outside fresh air rate.
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
@Trippl, What you need is the ACH (air changes /24 hour). Based on my experience, which may not be applicable now but I am sure still the same logic applies. For a electrical transformer room the ACH is 12- 15.any input on your surveillance of the sight? is it equipment oriented that heat must be removed? chemical that you just dont want air to be stagnant or toxic that you must maintain the LEL? In your case, assuming you need 8-10 ACH,@ 10 ACH, you CFM will be 486.CFM.
Hope that helps in a way.
Its been a while since I last worked in HVAC in the middle east and now my career is leading me to it again.
Feati
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
317069
0.06 cfm/sq.ft is the minimum, you could go over with any rate, But
your area: 1500+(4*500)=3500 sq.ft
Ashrae rate: 3500*0.06 = 210 cfm
210*60= 12600 cubic feet per hour
12600*(3500*20)= 0.18 air change per hour
it is ok for this kind of building
where did you get the 20?
0.06 cfm/sq.ft is the standard as per ashrae?
im from the philippines and i want to learn im not a mechanical but
i do understand some computation. im a saleman of exhaust fan but in my company there
is no mechanical engineer to estimate the exhaust.can you help me?
thank you in advance
edenriquez0601
RE: Small Warehouse Ventilation Requirements
RE: Small Warehouse Ventilation Requirements
first please state your location and intended use next time,
you are trying to ventilate a warehouse in summer months to keep it from getting too hot in there. I would use actually 10 ACH, not just 4 ACH, reason, the difference in cost between 4 and 10 ACH for wall mounted exhaust fan in almost nothing
BUT, let me tell you that you will need 5 FANS and Five outdoor sir intakes. You seem to provide just one fan for all your 5 spaces separated with fire dampers.
Code does not allow you to transfer air from one room to another (using a room as a plenum), so each of your fire rated rooms will require a dedicated fan with dedicated intake (they can be both roof mounted). Besides, you will avoid all the fire dampers.