1" End Cap Vent / Drain for Copper Manifolds $250 minimun the problem could be due

the problem could be due to condensation and creosote buildup causing the draft door to stick shut

Screwdriver-adjustable differential with direct-read indicator

960- for primary air intake(with molded elbow/stepper motor)

New version chimney cap/spark arrestor provides better fit

If replacing a steel door

1" End Cap Vent / Drain for Copper Manifolds $250 minimun the problem could be dueProduct Description 1" Alberta Tee End Cap Vent Drain End cap vent drain pieces are for use with 1" copper manifolds for radiant and SIM applications. They allow easy connection of an automatic air vent (1 8" NPT) and a drain valve (1 2" NPT) to the end of the copper manifold.