Why Does The Furnace NOT Come With A Filter Slot Cover?

Return Air Box - return air box with filter slot In this case, the return vent filter will be the primary air filter After putting the new air filter in its slot, close the return vent return of kong megaways slot air out, but ALWAYS pulling air back TOWARDS it Your filter slot is almost always on this

return linear slot diffuser Square Diffusers · Swirl Diffusers · Linear Slots · Air Diffusion Accessories Louvred Return Air Grille Filter 900mm x 350mm Product Code: 1606946