Bard CMH-20 Control 322838-754 a 4-inch diameter hole is

a 4-inch diameter hole is required for either roof or sidewall penetrations

Designed with a straight-through body pattern and flange

belt-type crankcase heater engineered for critical compressor protection in commercial and residential refrigeration systems

As a standard of maintenance for industrial flow control

05" round shafts or 3/8" to 3/4" square shafts using the standard U-clamp provided

Bard CMH-20 Control 322838-754 a 4-inch diameter hole isThe Bard CMH 20 Low Ambient Control is a field installable kit engineered for Bard wall mount heat pumps to enable reliable cooling operations in low temperature environments. This pressure actuated fan cycle control maintains optimal head pressure by cycling the outdoor fan motor when ambient temperatures drop below 60F. Designed specifically for compatibility with Bard WH series units, the CMH 20 head pressure control prevents evaporator coil freeze