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Firebacks are traditionally made from cast iron, but are also made from stainless steel. [10] Enclosed wood-fueled fireplace equipped with a blower fan which takes in air through the bottom vent, blows it around the firebox to heat it, and releases it via the top vent. Most older fireplaces have a relatively low efficiency rating.
Longitudinal bending to one side, caused by uneven seasoning or grain. See wood warping. crotch The section of a tree where a branch divides from the trunk, or the trunk divides in two; typically an area of convoluted grain. crossgrain Working perpendicular to the wood grain. crosscut A cut made perpendicular to the wood grain. crown of thorns
The area of the sides of a bird's head, behind and below the eyes. [96] chin A small feathered area located just below the base of the bill 's lower mandible. [97] cloaca A multi-purpose opening terminating at the vent at the posterior of a bird: birds expel waste from it; most birds mate by joining cloaca (a "cloacal kiss "); and females lay ...
Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.
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The amount of ventilation in an ETS area is equal to the amount of an ETS-free area plus the amount V, where: V = DSD × VA × A/60E V = recommended extra flow rate in CFM (L/s) DSD = design smoking density (estimated number of cigarettes smoked per hour per unit area) VA = volume of ventilation air per cigarette for the room being designed (ft ...
Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). [2] Standard mixing ventilation may be better suited for smaller spaces where air quality is not as great a concern, such as single-occupant offices, and where the room height is not tall (e.g., lower than 2.3 meters [7.5 feet]).
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