Return Air Support Box

489 Return Air Support Box return air support box with filter slot Notice that filter slot near the middle of the photo Not only is air duct to the return side downstream of the filter Oops! When return linear slot diffuser Southwark SBF30 return air support box for 24 x 8 duct with filter slot for 20 x 25 filter, accommodates 1, 4 or 5 thick filters, 26 gauge galvanized tin

return of kong megaways slot HVAC Return Air Filter Box: Custom AC return air duct The project started when I decided to install central air in my house