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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.

3. Duct (flow) - Wikipedia

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

   Downstream of the air handler, the supply air trunk duct will commonly fork, providing air to many individual air outlets such as diffusers, grilles, and registers. When the system is designed with a main duct branching into many subsidiary branch ducts, fittings called take-offs allow a small portion of the flow in the main duct to be diverted ...

4. Ventilation shaft - Wikipedia

   en.wikipedia.org/wiki/Ventilation_shaft

   Chipping Sodbury Tunnel ventilation shaft Swan St. ventilation shaft on the Burnley Tunnel Ventilation shafts of the Velser tunnel, the Netherlands. In subterranean civil engineering, ventilation shafts, also known as airshafts or vent shafts, are vertical passages used in mines and tunnels to move fresh air underground, and to remove stale air.

5. The Villages, Florida - Wikipedia

   en.wikipedia.org/wiki/The_Villages,_Florida

   ZIP code(s) 32159, 32162, 32163, 34731, 34785, 34762 ... Trump touched down at Ocala International Airport aboard Air Force ... crossing Florida State Road 44 near ...

6. Tuff Shed - Wikipedia

   en.wikipedia.org/wiki/Tuff_Shed

   Tuff Shed Incorporated is a manufacturer and installer of storage buildings and garages in the United States. The company currently operates multiple factories in multiple states. The company currently operates multiple factories in multiple states.

7. Hardened aircraft shelter - Wikipedia

   en.wikipedia.org/wiki/Hardened_aircraft_shelter

   Hardened aircraft shelter at RAF Bruggen, 1981 The HASs at RAF Upper Heyford in the United Kingdom are protected as scheduled monuments.. A hardened aircraft shelter (HAS) or protective aircraft shelter (PAS) is a reinforced hangar to house and protect military aircraft from enemy attack.