Are unvented fireplaces too hot to handle?

Documents what some builders have said about problems with moisture, soot and IAQ in relation to unvented gas fireplaces. Unvented gas fireplaces have become popular recently in the US due to their low cost and flexibility in installation. However many building scientists and indoor air quality professionals have warned against their use because discharging combustion by products into the home invites serious moisture and IAQ problems.

Measuring backdraft for health and safety.


Design guidelines for combustion air systems.

Fuel-burning appliances require air for combustion. When the appliances are located in enclosed spaces, provision must be made for supplying the required amounts of air. Depending on the specifics of the appliances and the enclosure, additional air may be required for draft hood dilution and space conditioning. An enclosed space can be a mechanical room in a building, a furnace room in a residence or the entire floor of a building if a separate enclosure is not used to isolate the combustion appliance(s).

Carbon monoxide.


The effects of improved residential filtration on particulate exposure.

Forced air furnaces are a common Canadian heating system. Traditionally, filters placed in thecirculating air ductwork were designed to protect the furnace and fans. Over the last severalyears, there has been increased emphasis on improving the filtration efficiency with the goal ofreducing occupant exposure to respirable particulate. The current research project rotatedseveral filters through six houses in southern Ontario during the heating season.

A field experiment on indoor consistency distribution of combustion gas by ventilation performance of range hood.

In apartments of Korea, exhaust-only hood system is commonly installed for kitchen ventilation. However, as to resident's increasing complaints recently due to poor indoor air quality and hood noise, a careful review regarding kitchen ventilation system came to be in need. This paper presents a research that was conducted to improve ventilation problems in the existing kitchen of apartments. For this purpose, a field test has been carried out to examine the effect of range hood's exhaust airflow rates, and makeup air inlet's settings on kitchen ventilation efficiency.

Surveys on depressurisation-induced backdrafting and spillage.

Surveys on repressurization-induced backdrafting and spillage were conducted in threedifferent areas of the United States using a common protocol, primarily to assess thecorrespondence between short-term tests and one week of continuous monitoring per house.The short-term tests, under induced conditions, can only indicate whether there is a possibilitythat backdrafting or spillage might occur, whereas real-time monitoring under naturalconditions can give a true indication of backdrafting and spillage events.

A bright future for advances fireplaces.


Indoor air pollution exposures of low-income inner-city residents.

This report is based on a pilot project for a large epidemiologic study of inner-city asthma, in which exposures to air pollutants will be related to both incidence and prevalance of asthma. Nitrogen dioxide concenmuions were measured in three rooms as well as outdoors in 44 inner-city apartments with gas cooking stoves. Fifty-two separate month-long series of 48-h time-integrated NO, sample. (Palmes tubes) were gathered from fall 1982 to spring 1984. The 48-h average N02 concentrations taken within homes frequently exceeded the U.S.