Abstract: An odor filtering device for space dispensing a volatile oil by soaking a porous substrate with a malodor counteractant composition. The exposed surface of the substrate permits evaporation of malodor counteractant creating an internal vapor pressure differential which drives the counteractant from the interior of the substrate to the surface to replace the surface loss. Particular devices are formed and arranged to permit controlled release of the malodor counteractant over an extended period of time.

Abstract: A unit for prevention clogging in condensate drain pans by discharging an anti-bacterial chemical into the drain pan to prevent slime accumulation is provided. The anti-bacterial chemical comprises of a first low-soluble anti-bacterial compound and a second readily soluble compound having a higher solubility that the first low soluble anti-bacterial compound. The device is provided with a novel cap having metering orifices for effecting a controlled diffusion rate of anti-bacterial chemicals into a drain pan and further including projections for spacing the metering orifices away from a surface, the spacing in combination with the metering orifices and solubility characteristic of the anti-bacterial chemical effecting a capillary action to introduce the anti-bacterial chemical through the orifice into contact with the condensate at a controlled rate.