Ask Your Question

Angie's List Answers is the trusted spot to ask home improvement and health questions and get answers from service companies, health providers and consumers. For ratings and reviews on companies in your area, search Angie's List.

Top 30 Days Experts
Rank Leader Points*
1 kstreett 240
2 Guest_9020487 110
3 Guest_9190926 105
4 GoldenKid 100
5 ahowell 95
6 KnowledgeBase 95
7 skbloom 80
8 Guest_98024861 70
9 Guest_9311297 70
10 Guest_9400529 70

*Updates every 4 hours

Browse Projects By Category

Question DetailsAsked on 4/7/2016

is microbial treatment such as EnviroCon for the HVAC duct system safe?

I'm wondering if treating my HVAC ducts with an antimicrobial treatment is safe in the long term. The product, EnviroCon supposedly is safe for humans and pets and eliminates mildew, mold, dust mites, and other allergens in the air. I can't seem to find any reviews online.

Do you have the same question? Follow this Question

2 Answers


Answered 4 years ago by BayAreaAC


EnviroCon generates chlorine dioxide - a disinfectant/biocide that has been used industrially for probably 50+ years that I know of - commonly used for high-level disinfection for wastewater and water treatment plants and water treatment, hospital and food processing plant disinfection of inacessible areas and ducting and piping including disinfection against legionaires disease and anthrax for example.

And does not have the high respiratory hazard of chlorine gas or high levels of ozone - though can be adverse for people with respiratory sensitivty to chemicals, especially for the first few hours after application.

The issue of "safe for humans and pets" - the EPA's own website admits that the scientific data on its safety in direct breathing contact with people is indeterminate - so OSHA requires worker respiratory protection during use. Considering it destroys bacteria by breaking down the cell structure of basically any living organism - while it is considered safe for use in that it does not leave a significant residual after application and a good airing out (so is effective at time of application but does not prevent future contamination/regrowth), certainly one would be a fool to knowlingly stay in contact with air containing it.

Though it breaks down (quickly) in air, chlorine gas is one of the intermediate products until ozone and sunlight break it down further - so pets and occupants should be out of the house during treatment, but after ventilation of the house can reenter fairly soon - typically about an hour after treatment. Some applicators use it in ducting while a building is occupied - just plain dumb in my mind, and there have been cases of workers and building occupants being overcome by it when it was first considered harmless. Sort of a total brain freeze on that - you are using something that kills all living organisms it touches yet you consider it safe to use in occupied building ? Duhhhhh !

The fact the applicators wear respiratory protection should be your first indication that being in the house (including pets) while it is being treated is not too bright. Fish and amphibians (aquarium/terrarium) are also sensitive to it and can be killed. Typically aquariums/fishbowls that are too large to conveniently take out of the house can be sealed with saran wrap thickness plastic and aluminum foil sealed to the tank for the hour or two needed without harming the occupants.

Answered 4 years ago by LCD

Related Questions

Terms Of Use
Privacy Policy