Model No. 250.5-AF

Economy Model No. 451-AF

SUGGESTED SPECIFICATION
for Architects and Engineers
An air filter gage for measuring the resistance to air flow through the filters shall be installed, one for each bank of filters. The gage shall be of inclined tube differential type (equipped with vent valves for zeroing) shall be of solid acrylic plastic construction with built-in level vial (and over pressure safety traps 250 Series only), shall have an adjustable mirror-polished scale, shall be furnished complete with two 5-foot lengths 1/4" tubing, two static pressure tips, mounting hardware, additional bottle of red gage oil and instructions.