back draft


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back draft

[′bak ‚draft]
(metallurgy)
A reversed taper given to a casting model or pattern to prevent its withdrawal from the mold.
References in periodicals archive ?
(2011) found that parallel units can leak conditioned air from the housing through seams, penetrations, and the back draft damper.
Festival of Colours provides a back draft for celebrating life and creates an ambience for eternal festivities, the statement said.
I wasn't completely dumb by then and made sure that every house had a controlled ventilation system and made sure that all the gas furnaces and gas water heaters had combustion air and that we had tight return systems so we didn't back draft anything.
The lettings market is almost proving to be the back draft to purchasing.
However, as he got closer, a back draft of smoke, fire, and extinguishing agent blew back in his face, forcing him to back up.
Localized fume extractor devices include down draft, back draft, and snorkel exhaust vents, which are used in histology/gross dissection and special chemistry.
Your article titled "Southwest Back Draft?" (September), while timely, misses the mark.
The "back draft" could prevent the pilot chute from doing its job and keep it hovering behind the pack.
She was obviously too busy rummaging through rails of skirts, tops and vests to notice the, erm, back draft.
In Minnesota, if designers specify 1,200-cfm hoods, they must provide another opening to create positive pressure to prevent back draft.
"Depending on where the fireplace is installed, smoke can back draft into the house," Dischner says, "so the guidelines are good at indicating where the fireplace should be located." Putting the fireplace in the most efficient location will also help prevent such problems as poor draft and odors.
Bruce shot the buck with a Browning Back Draft bow set at 72 pounds.