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Due to greater wind resistance, roof racks may increase wind noise on the highway. Mounting the roof rack backward may reduce air resistance. [7] Some bars are designed with a lower drag coefficient or have a wind deflector at the front to reduce this problem. When installing roof racks, it is essential to load the bars properly per the owner's ...
A dorade box (also called a dorade vent, collector box, cowl vent, or simply a "ventilator") is a type of vent that permits the passage of air in and out of the cabin or engine room of a boat while keeping rain, spray, and sea wash out.
The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure. On large systems, separate parallel vent stacks may also be run to ensure sufficient airflow, because the number of devices linked to an atmospheric vent, and their distances from it, are regulated by plumbing code.
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Mechanical fans can be used to provide positive pressure ventilation by breaking or removing windows, skylights or heat/smoke vents on the roof; or by cutting new exhaust vents in the building. If there is no suitable existing hole, firefighters may use their equipment to make one, such as specialized saws for cutting a large hole in the roof.
An air handler is usually a large metal box containing a blower, furnace or A/C elements, filter racks or chambers, sound attenuators, and dampers. [2] Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the AHU, sometimes exhausting air to the atmosphere and ...
Box gutters are essentially placed between parallel surfaces, as in a valley between parallel roofs or at the junction of a roof and a parapet wall. They should not be confused with so-called valley gutters or valley flashings which occur at the non-parallel intersection of roof surfaces, typically at right angled internal corners of pitched roofs.
Typically the hod carrier or 'hoddie' will be employed by a bricklaying team in a supporting role to the bricklayers. Two bricklayers for each hod carrier is typical. A hoddie's duties might include wetting the mortar boards on the scaffolding , prior to fetching bricks from the delivery pallet using his hod and bringing them to 2x2 wide ...