How to shut off a duct when not in use?
What's the name for a thing I can use to shut off my lampwork-duct when its not is use? I've just spent thousands insulating the building and making it more air-tight, so i'd appreciate air not leaking in through the lampwork-vent! I was wandering if there existed something that was manually operated, and physically blocked the ducting...? (other than shoving a towel in the duct line!)
No one in the UK really has hvac.. other than commercial premises where the companies won't speak to me.. so i'm struggling to find parts, which isn't helped when i don't know what things are called!
Thanks,
Charli
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