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Kinks in flexible ducting must be avoided. Some flexible duct markets prefer to avoid using flexible duct on the return air portions of HVAC systems, however flexible duct can tolerate moderate negative pressures. The UL181 test requires a negative pressure of 200 Pa. To use flexible ducting in a system, make sure to pull the duct tight so you ...
Flexible Flyers are flexible both in design and usage. Riders may sit upright on the sled or lie on their stomachs, allowing the possibility to descend a snowy slope feet-first or head-first. To steer the sled, riders may either push on the wooden cross piece with their hands or feet, or pull on the rope attached to the wooden cross-piece.