Freeman article (28. below) describes two components of imported fire ant (IFA) venom: proteins and alkaloids. The immune response, especially IgE (an antibody, "immunoglobulin E"), is generally to the protein component of foreign substances - 4 in Solenopsis invicta (the red IFA) and 3 in Solenopsis richteri (the black IFA). There is evidence that people who are sensitive to IFA have IgE to the venom proteins. Freeman is unaware that anyone has demonstrated IgE to the alkaloids.

Direct-vent products derive their combustion air from outside of the home. This is often achieved through either side by side vent pipes or pipes designed with one pipe inside another. One of the two pipes brings in the fresh air and the other expels exhaust gases. Direct-vent products are generally considered to be more efficient than b-vent models.

These terms refer to how a gas appliance takes in the air it needs to burn gas. A B vent unit draws air from inside the home, through ports in the firebox itself. A Direct Vent unit draws air through a pipe from outside the home, into a sealed firebox. Direct Vent models are usually more efficient and safer for today's airtight homes, since they do not use inside air or cause a conflict with range hoods and bathroom fans circulating the same air.

B-Vent fireplaces (sometimes called Top Vent or Natural Vent) draw air into the combustion chamber from inside the home. This fresh air is mixed with gas and burned in the fireplace. The fireplace exhausts the byproducts of combustion outside of your home using a dedicated B-Vent flue pipe. Although fresh air is used from inside your home, products of combustion are never vented into your home. Back to Top

e are three different terms that represent three different ways of 'venting' a gas fireplace, that is, to supply combustion air to the fireplace and evacuate combustion gases out of the house. In Australia, the term 'open flue' is commonly used instead of 'B-vent'. B-vent means a traditional type 'B', 4' (102mm) rigid pipe used to evacuate combustion gases. It can also be a certified flexible aluminium liner of the same diameter, inserted into an existing masonry chimney or a prefab chimney.

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A direct vent fireplace is a sealed unit that gets its combustion air from outside of the home. The direct vent pipe can vent either vertical or horizontal and can use elbows to go around obstructions. B-Vent units use combustion air from the home but can be enhanced with an outside air kit. B-Vent pipe must terminate vertically and you must follow the installation instructions of the B-Vent manufacturer.

A wood-burning fireplace is totally vented. For a complete explanation of these terms see our Venting page.

Cabinets are boxes that extend about 18" from the wall. Mantels are wood frames that only extend about 4" - 6" from the wall. B-vent cannot have a cabinet. A b-vent fireplace must be installed in the wall, allowing all the piping to be hidden. You may then use a mantel. Vented gas logs can only be used in a wood-burning fireplace. A coal-burning fireplace is too shallow. Vented gas logs are not recommended for a stove due to safety concerns.

A b-vent fireplace is the least efficient venting option and can be vented horizontally or vertically. Direct venting is the most efficient; some are even "heater rated" and can be vented horizontally, vertically or both.

Answer: A B-Vent fireplace draws air from inside the home through ports in the firebox itself. A Direct Vent unit draws air from outside through a pipe into a sealed firebox. Find A Top Air Conditioning ContractorThis is a hot summer dont suffer through it install air conditioning.airconditioning-contractor.com

A B-vent must be vented vertically and uses air from inside the home to provide oxygen to the fire. A direct vent uses a sealed glass front and pulls all of its combustion air from outside the home. This is important in new construction or well insulated homes that are tightly built. Direct vents can be vented vertically or horizontally through an exterior wall. Direct vents are more efficient than B-vents since they do not take any air out of your home.

The evidence is strong. The earliest experimental evidence that UV-B radiation causes skin cancer was acquired with animals; in humans there was a clear association between sun exposure and skin cancer, but that did not point specifically to UV-B. In recent years the advancement of molecular biology has provided us with analyses that produce direct evidence that genetic alterations found in human skin carcinomas are indeed caused by UV-B radiation.

These type of fireplaces do not have a sealed combustion chamber and relies on the bouyancy of hot gases to vent effectively. They must be installed either with an existing chimney that meets the local building code standards or they can be installed using a B vent which is a vent pipe that must be installed to the same parameters of a masonry chimney but can be enclosed in combustible material. They draw air (oxygen) necessary for combustion from the area surrounding the fireplace.

Yes, I spend most of the day wearing a mask and ear defenders. You should warn your neighbours what is going on; if you live in a flat I strongly recommend you check the lease to see if there is any mention of wooden flooring.