Antihistamines, H1. Histamine antagonists or antihistamines are drugs that relieve allergy symptoms.Histamine is a chemical used to identify and remove substances that trigger an allergic response. Ã¢ There are four histamine receptors &#40;designated H<sub>1</sub>, H<sub>2</sub>, H<sub>3</sub>, H<sub>4</sub>&#41;.
Water leaks in central air conditioners are almost always caused by a problem with the condensate pan or drain pipes. The most common of those problems is a clogged drain line. When your condensate drain line gets clogged, water backs up and builds up in your pan. With nowhere to go, that water will begin to leak over your drain pan and onto your system and your floor. Another problem that can lead to a water leak is a crack somewhere in the pan or in the drain pipes.
Report Abuse. Some air conditioners contain freon, carbon dioxide or ammonia. All are bad for the environment (CO2 isn't as bad as people think it is, people make CO2 when they breathe). But these chemicals stay inside of the air conditioner, these gases are responsible for making it cold.ir conditioners do not normally make a reaction that involves releasing CO2 (except when the fail and burn up, I suppose).