Field Controls 46487401 Vent Damper Freon Its unique 4-way flexing action

Its unique 4-way flexing action effectively absorbs shock

ideal for complex sequencing

What is the difference between a fixed and adjustable differential control

Use a clamp-on ammeter to monitor the starting circuit

Field Controls 46487401 Vent Damper Freon Its unique 4-way flexing actionThe Field Controls 46487401, also known as the GVD 9PL, is a 24Vac automatic vent damper designed to improve the thermal efficiency of atmospheric gas heating systems. This 9 inch unit is the professional grade direct replacement for Q35RL 1 models, ensuring seamless integration into existing boiler or furnace stacks. Engineered for stainless steel durability, the GVD 9PL gas vent damper operates by closing the flue pipe during the off cycle,