I’m getting quite a few requests for ventilation details on new double-wide, tunnel wean-finish and grow-finish facilities. In addition, I’ve reviewed the ventilation system as installed at quite a few sites in recent weeks. Unfortunately, the many builders and facility owners still undersize the attic inlet area and end up with higher electricity expense and tunnel curtains opening at colder outside temperatures that expected/desired.

Here are the design details that I use for soffit inlet sizing when double-wide tunnel barns are 102 x 196 in dimensioning:

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