Indoor air quality in houses deteriorates due to building components, outside air, household goods, people and combustion systems. In these places where people spend most of their lives, the air and the environment must be clean.

Radon gas passing through building materials should be at most 4 pCi/L. These levels should be measured before starting and using the building.

The exchange of indoor air with outside air should be adjusted very well. The air in the spaces in the houses should be changed at least 0,35/1 times per hour. In this case, the need for mechanical ventilation in the houses definitely arises.

Paint, varnish, varnish, coating, etc. containing harmful substances in household goods. The use of substances should be limited, the environment should be more ventilated in newly painted or renovated houses.

As a result of the movements of people, dust and carpet fibers are flying in the indoor air. A large part of these dusts can be caught by using air cleaner devices in homes.

Combustion systems that most affect indoor air quality in homes; cigarettes, cooking devices, stoves and water heaters. During the use of these devices and cigarette consumption, very dangerous combustion products and toxic substances are emitted into the environment. Combustion systems must be connected to a chimney.

Considering the oxygen requirement of the combustion systems in the houses, the required outdoor air flow rate should be increased in the winter months.

1.11 ASHRAE DOMESTIC VENTILATION STANDARD

Before 1996, a small part of the ventilation standard (Standard 62) was devoted to domestic ventilation. ASHRAE put forward the necessity of establishing a separate standard for domestic ventilation and formed a committee for this purpose. Seven years later, the ASHRAE 62.2-2003 Standard (which can also be reviewed in Leed 2007 and 2010 Standards) was approved. This Standard defines the minimum requirements necessary to provide minimal acceptable indoor air quality for typical situations. The standard describes the close relationship between dilution ventilation and flexible interventions for source control and permitted operations.

Standard 62.2 is not an overly complex or long document. This can be applied to new and existing homes, including all single-family homes and small family homes. Its major requirements are:
 With some exceptions, the standard requires mechanical ventilation for the whole house. For a typical house, the required ventilation rate is about 25 L/s, but this value increases with the size of the house. Provides flexibility in the selection of standard ventilation system.
 Mechanical exhaust (to outside air) is required in kitchens. Basic condition; air exhausted from a user-controlled hood is at least 50 L/s. Although kitchen designs are very different in the market, 5 air changes per hour (continuous or intermittent) of the kitchen air are required.
 Mechanical exhaust from bathrooms is required, but not in toilets, laundry rooms, sink rooms. The basic requirement is to exhaust at least 25 L/s of air with a user-controlled fan. A continuously running exhaust fan can alternatively be used with a flow rate of 10 L/s.
 Fans or fan systems must meet the previous requirements but meet the specific airflow and noise performance levels.
 Rules in the application should be followed in combustion devices. For a more restricted situation, the discharge systems of combustion devices should be checked for backfire and leaks. Otherwise, there is no need for special combustion devices with or without discharge.
 If the air handling unit or return ducts run through the garage, the ductwork must meet sealing specifications.
 Good particle filter is required for air plant feeds (Minimum filtering requirement can be easily met, but better results are obtained with commonly used fiber filters).

A small number of other requirements are secondary considerations related to general application conditions or special cases.

Comfort and Ventilation Requirements

 A person at rest consumes between 0.1 and 0.12 L/s of air.
 Our lungs absorb only 5% of the oxygen in this air.
 The air we exhale contains only 4% carbon dioxide (0.004 L/s).
 Outside air per capita is very low, around 0.847 L/s.
 The measure of sufficient air movement is that people feel comfortable and spacious.
 5 L/s per person is sufficient to remove body odors. However, 8 L/s per person should be preferred.
 In factory canteens where people are concentrated, this value is recommended as 10-15 L/h per person.
 An adult worker emits 0.1 kW of sensible heat.
 Assuming a ventilation rate of 16 L/s/person (This is the minimum airflow required to remove body odors) temperature rise = (0.1 x 1000)/(16 x 1.205 x 1.012) = 5.1 K (any additional airflow in the room) assuming there is no heat gain/loss).
 If air conditioning will not be used, the ventilation air is also used to remove the collected heat.
 A worker at rest produces 0.04 kW latent heat.
 This is against the output of this much moisture.