Reduced air flow into heater
I bought these magnets for the same reason as the above review and am very happy with them. Our heater now burns overnight without any problems....the magnets work very well and don't move around when opening and closing the damper. Saved a lot of messing around welding pieces over the holes and can be adjusted at any time if needed. My order was despatched quickly....very happy with the service from AMF. Thank you