it is optimized for high-demand environments

or exhaust fans

Note that this is the valve body only

If the air handler is blowing cold air during a call for heat (W1/W2)

Danfoss 193B-1535 4 Way Valve 30067439-890 it is optimized for high-demandThe Danfoss 193B 1535 4 way reversing valve is a heavy duty brass component engineered for high capacity heat pump and air conditioning systems. With a 29. 3 CV flow coefficient and 1 1 2 inch ODF connections, this valve provides precise refrigerant flow reversal with minimal pressure drop. Designed for peak volumetric efficiency, it utilizes a pilot operated sliding block mechanism that ensures reliable performance even under high differential