Reason for 2 1 filter slots on hvac Merv 2 and 5

Return Air Support Box with Filter Rack by Southwark Metal Mfg Co

Return Air Support Box with Filter Rack by Southwark Metal Mfg Co

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

return of kong slot Snappy™ SBF30 Return Air Support Box with Filter Drawer, 30x28x15 in D, Steel, Galvanized