Alpine SBFD36 36 Inch Wide Return Air Support Box With Filter Slot

Contents · 1 Waveguide branch-line coupler · 2 Bethe-hole directional coupler · 3 Riblet short-slot coupler · 4 Schwinger reversed-phase coupler

-deep filter The topside of the box is covered with sheet metal with a duct near the middle What this means is that air being pulled into the

return air support box with filter slot Is is common that there is a filter both at the return air intake AND at the furnace? slot for a filter if you choose to use intake

return to the feature slot Other places you may find the air filter are in a slot above or below your HVAC unit, or right behind the return grills in your home (see