Condensation, Ventilation and Humidity:
In all types of building, proper humidity is necessary for good health and the comfort of the occupants, as well as for the proper maintenance of the structure and the furniture. If the humidity lever is too dry, people may experience a dry feeling of the skin, scratchy throat and high levels of electricity resulting in shocks and clothing clinging to the body. If furniture, books, and structural member of the home become to dry, they may be damaged by possible shrinkage. A satisfactory humidity level for a manufactured home is one that can be maintained without moisture condensation on the windows, sills, or walls. During the winter (depending on whether or not storm windows are in use), a maximum of 30% or 35% relative humidity may be sufficient. Your manufactured home is enclosed by an "envelope" of insulation material which is adequate for the thermal zone for which your manufactured home was constructed. Windows are also considered part of the "envelope" and must meet specified air and water infiltration tests. Moisture can be regulated by the use of exhaust fans or opening windows in your home. Too much moisture (condensation), can be as damaging to your home as too little, particularly in the winter. Because warm air has the ability to hold more moisture that cold air, the tendency is for the water vapor to move from a warmer to a cooler place. Thus, windows may fog or frost. Moisture may accumulate on walls, windows, doors, millwork, ceilings, and floors. This build-up of moisture may cause stains and if the condensation problem persist, it may cause deterioration of parts of your manufactured home.
Some functions in the home which tend to cause condensation problems are: cooking, laundering, and bathing.
If gas is used for cooking, the open flame will produce hydrogen as one of the products of combustion. This hydrogen combines with the oxygen in the air to produce condensation (water). To prevent an accumulation of moisture condensation in kitchens and bathrooms you may utilize an electrically powered vent fan or a slightly opened window. Remember, it is very important that you control the amount of condensation in your home. Do not turn the thermostat down to the point where condensation forms on windows and walls. This may actually cause a water vapor to build up inside your walls and may cause your home to deteriorate.
Much condensation can be prevented by heat and ventilation. By opening windows and/or doors in the summer you allow the water and vapor in the air to readily escape. At other times, it may be advisable to have a fan that will exhaust the water vapors in operation.
Natural circulation of air or the movement of heated air, by a fan or blower, can remove "cold spots" in a room where condensation is liable to occur. Most heating units require no extra ventilation