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on 3 September 2017

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Ventilating is the process of "changing" or replacing air in any space to provide high indoor air quality.
Ventilation is used to remove unpleasant smells and excessive moisture, introduce outside air, to keep interior building air circulating, and to prevent stagnation of the interior air.
Ventilation includes both the exchange of air to the outside as well as circulation of air within the building.
It is one of the most important factors for maintaining acceptable indoor air quality in buildings. Methods for ventilating a building may be divided into mechanical/forced and natural type.
Natural ventilation is the ventilation of a building with outside air without the use of a fan or other mechanical system.

It can be achieved with open-able windows or trickle vents when the spaces to ventilate are small and the architecture permits.

In more complex systems warm air in the building can be allowed to rise and flow out upper openings to the outside (stack effect) thus forcing cool outside air to be drawn into the building naturally through openings in the lower areas.
"Mechanical" or "forced" ventilation is used to control indoor air quality.
Excess humidity, odors, and contaminants can often be controlled via dilution or replacement with outside air.
However, in humid climates much energy is required to remove excess moisture from ventilation air.


Monday, September 04, 2017
Vol XCIII, No. 311
Low Rise Design
The following summarizes the key requirements for ventilating low rise buildings:
A low-rise building is an enclosed structure whose architectural height is
below 35 meters
, and which is divided at regular intervals into occupable levels.
It encompasses all regular multi-story buildings which are enclosed, which are below the height of a high-rise, and which are not entirely underground.
Low-rise buildings must be based on solid ground, with a fabricated framework. Structures which are mobile or which are built into the earth are not considered low-rise buildings.
1. A whole-LOW RISE building's mechanical ventilation system shall be provided.

2. Kitchens and bathrooms shall have local exhaust systems vented to the outdoors.

3. Clothes dryers shall be vented to the outdoors.
Typical Solutions for Whole-Building Ventilation
There are three generic solutions to meeting the outside air ventilation requirement:

1. Exhaust ventilation

2. Supply ventilation

3. Combination of supply and exhaust ventilation. If the supply and exhaust flows are within 10 percent of each other this is called a balanced ventilation system.
Miscellaneous indoor air quality design requirements apply, including:
1.Ventilation air shall come from the out of doors and shall not be transferred from adjacent dwelling units, garages or crawlspaces.

2. Ventilation system controls shall be labeled and the home owner shall be provided with instructions on how to operate the system.

3. Combustion appliances shall be properly vented and air systems shall be designed to prevent back drafting.
4. The walls and openings between the house and the garage shall be sealed.

5. Habitable rooms shall have windows with a ventilation area of at least 4 percent of the floor area

6. Mechanical systems including heating and air conditioning systems that supply air to habitable spaces shall have MERV 6 filters or better7. Dedicated air inlets (not exhaust) that are part of the ventilation system design shall be located away from known contaminants.
7. Dedicated air inlets (not exhaust) that are part of the ventilation system design shall be located away from known contaminants.

8. A carbon monoxide alarm shall be installed in each dwelling unit in accordance with NFPA 720, Standard for the installation of Carbon Monoxide (CO) Detection and Warning Equipment

9. Air moving equipment used to meet the whole-building ventilation requirement and the local ventilation exhaust requirement shall be rated in terms of airflow and sound
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