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2. Ventilation (architecture) - Wikipedia

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

   For residential buildings, which mostly rely on infiltration for meeting their ventilation needs, a common ventilation rate measure is the air change rate (or air changes per hour): the hourly ventilation rate divided by the volume of the space (I or ACH; units of 1/h). During the winter, ACH may range from 0.50 to 0.41 in a tightly air-sealed ...

3. Heat recovery ventilation - Wikipedia

   en.wikipedia.org/wiki/Heat_recovery_ventilation

   Diagramatic operation of a thermal wheel Ljungström Air Preheater by Swedish engineer Fredrik Ljungström (1875–1964). A thermal wheel, also known as a rotary heat exchanger, or rotary air-to-air enthalpy wheel, energy recovery wheel, or heat recovery wheel, is a type of energy recovery heat exchanger positioned within the supply and exhaust air streams of air-handling units or rooftop ...

4. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Ventilation on the downdraught system, by impulsion, or the 'plenum' principle, applied to schoolrooms (1899) Natural ventilation is the ventilation of a building with outside air without using fans or other mechanical systems. It can be via operable windows, louvers, or trickle vents when spaces are small and the architecture permits.

5. These Top-Rated Exhaust Fans Are Just What Your Musty ... - AOL

   www.aol.com/lifestyle/exhaust-fans-help-control...

   Exhaust fans keep fresh air circulating in your home. Say goodbye to steamy bathrooms, stuffy garages, or smoky kitchens with the best exhaust fans.

6. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   However, they are seldom used as the actual basis of design or calculation. For example, residential ventilation rates are calculated based on area of the residence and number of occupants. [5] Non-residential ventilation rates are based on floor area and number of occupants, or a calculated dilution of known contaminants. [6]

7. Yes, You Really Need To Clean Your Bathroom Exhaust Fan ... - AOL

   www.aol.com/yes-really-clean-bathroom-exhaust...

   To keep your bathroom exhaust fan dust-free and properly functioning, it's best to clean your fan once every six months or more if your fan gets dusty quick. Regularly inspect your fan for any ...