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2. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

3. Vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Vacuum_cleaner

   Only the hose and cleaning head need be carried from room to room, and the hose is commonly 8 m (25 ft) long, allowing a large range of movement without changing vacuum inlets. Plastic or metal piping connects the inlets to the central unit. The vacuum head may be unpowered, or have beaters operated by an electric motor or by an air-driven turbine

4. Materials for use in vacuum - Wikipedia

   en.wikipedia.org/wiki/Materials_for_use_in_vacuum

   Materials for use in space [ edit ] In addition to the concerns above, materials for use in spacecraft applications have to cope with radiation damage and high-intensity ultraviolet radiation , thermal loads from solar radiation, radiation cooling of the vehicle in other directions, and heat produced within the spacecraft's systems.

5. Ventilation (architecture) - Wikipedia

   en.wikipedia.org/wiki/Ventilation_(architecture)

   Spaces where space contamination is normal, or similar to an office environment: Conference rooms, lobbies 0.12 cfm/ft 2: 0.60 L/s/m 2: Spaces where space contamination is significantly higher than an office environment: Classrooms, museums 0.18 cfm/ft 2: 0.90 L/s/m 2: Spaces where space contamination is even higher than the previous category

6. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   Ceiling fans have multiple functions. Fans increase mixing in a ventilated space, which leads to more homogenous environmental conditions. Moving air is generally preferred over stagnant air, especially in warm or neutral environments, so fans are useful in increasing occupant satisfaction. [4]

7. Retractable roof - Wikipedia

   en.wikipedia.org/wiki/Retractable_roof

   A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a ...