Since opening in 1987 sheet metal werks has grown on pace with increasing customer demand.
Insulated sheet metal plenum.
The trim to fit plenum fully assembled measures 20 in.
Winchester 20 5 in x 21 in x 28 in return air box assembly duct plenum.
Fibrous glass duct wrap insulation is designed for application to the exteriors of commercial and residential sheet metal heating ventilating and air conditioning ducts and plenums operating at temperatures between 40 f 4 c and 250 f 121 c.
W x 20 in.
Currently housed in an 80 000 square foot facility we have the capacity for your largest custom jobs whether you are installing hvac ductwork at a hospital a high rise a mall or an office building.
Contact a location arizona lake havasu city arizona 928 846 8707 peoria arizona 480 385 1380 california anaheim california 714 933 1777 chatsworth california 818 884 1100 chino california 909 267 1124 el cajon california 619 566 8130 escondido california 760 233 2545 la habra california 562 257 1133 laguna hills california 949 598 8333 oceanside california 760 797 6234.
Lined metal or board return ductwork upstream from an effective filter is not usually a problem.
I noted this furnace has ductboard plenums note the plural.
Note that includes supply ducts within 36 of the supply plenum too.
D x 47 in.
Plenum boxes insulated with duct liner for residential a plenum box fits over the inside unit and is the first stage of the air supply.
Item 523685 model rab21rab21.
Codewise supply plenums on furnaces must be constructed only of sheet metal nfpa 90b.