Maxitrol RV48L Natural Gas Pressure Regulator, 1/2" FPT Thread, 13/16" In and Out Opening, 1/2 PSIG In, 3"-6" WC Out (1/2" Natural Gas NG) Size_24"x18" The split Blower Unit is

The split Blower Unit is installed in the attic (above ceiling)

air curtain is not to replace an air conditioner

Coverage up to 1650 sq ft

However when the 3 minutes auto shut off is completed

Maxitrol RV48L Natural Gas Pressure Regulator, 1/2" FPT Thread, 13/16" In and Out Opening, 1/2 PSIG In, 3"-6" WC Out (1/2" Natural Gas NG) Size_24"x18" The split Blower Unit isGAS TYPE & PRESSURE Gas Type: Natural Gas (NG). Inlet gas pressure: 1 2 PSI. Outlet pressure range: 3" 6" Water Column PIPE THREAD SIZE 1 2" Inlet & 1 2" Outlet FPT GAS PIPE. Make sure you measure the gas pipe or regulator opening as close to 13 16 inches as shown in the pictures table. CAUTION This regulator has 13 16" openings for 1 2" gas pipes. The 1 2" gas pipe means interior diameter 1 2" but outside diameter is 13 16", refer to the pictures