MEASURING MODELS 170+ 173+270 CEILING OPENING Masai __ Jj 0 MEASURE DUCT OPENING. — wom 'SIDEWALL OPENING For Sidewall or Selling Applications STEP ONE: First measure the duct opening on the wall or ceiling where the 170 model will be placed on. NOTE: Remember to measure the duct ‘opening on the wall not the medal selfish [Th TI III (Example: if the duct opening measures 14x 10 then use Model 170 14x 10.
