Who and What is ACCA?

WHO – is a non-profit association serving more then 60,000 professionals and 4,000 businesses in the HVAC community, working together to promote professional contracting, energy efficiency and healthy, comfortable indoor environments.

WHAT – they are the go-to organization for all residential home indoor energy conservation, design, and installation procedures. All NATIONAL, STATE, and LOCAL building codes utilize ACCA’s expertise in the writing of the Building and Energy Conservation Codes. ACCA’s technical manuals are the bedrock of air conditioning in America. ACCA manuals will be referred to many times throughout this website.

  • Manual J, Residential load calculations
  • Manual D, Residential duct design
  • Manual B, Air balancing and testing
  • Manual S, Residential equipment selection

Duct Cleaning and Sanitization

Duct Cleaning

Duct cleaning has never been shown to actually prevent health problems.

EPA (US Environmental Protection Agency) website.

Since 99.9% of all Southwest Florida residential homes have a certain amount of fiberglass duct board incorporated into the air distribution system, making it impossible to clean. Fiberglass duct board is porous, allowing any contaminants to absorb into the duct board. Duct cleaning equipment was designed for hard surface duct systems, such as sheet metal.

Once fiberglass duct board or liner is contaminated with mold, cleaning is not sufficient to prevent regrowth and there are no EPA-registered biocides for the treatment of porous duct materials. (located under bullet point “Unresolved Issues of Duct Cleaning”)

Click here for EPA guidelines – (located under bullet point “Unresolved Issues of Duct Cleaning”)

Duct Sanitization

Since 99.9% of all residential duct systems have a certain amount of porous fiberglass duct work, you should never try and sanitize it. The sanitization product will be absorbed into the porous fiberglass. Chemical biocides are regulated by EPA under the Federal pesticide law. It is a violation of Federal Law to use a pesticide product in any manner inconsistent with the label directions. There is NO product currently registered as biocides for use on fiberglass duct board or fiber glass lined ducts.

Be careful of companies offering duct sanitization.

Click here for EPA biocide guidelines(located under bullet point “Unresolved Issues of Duct Cleaning”)

How to Properly Size a Duct System

ACCA Manual D is the recommended method to size your duct system. Before you can start to size your duct system, your home’s air conditioning equipment size must be known. This will require a load calculation (ACCA Manual J) to be performed on your home. Once you know the sizing requirements, you will know the air flow (CFM) that is required to make your system perform to the manufacturer’s specifications.

Fact is, most duct systems have been grossly undersized by most installers, leaving the system under performing and causing serious damage to the rest of your system. This includes premature rusting of the air handler, air handler motor failure, compressor failure and excessive power bills.

Air conditioning contractors have been using duct sizing calculators that are designed for sheet metal duct work.

Today’s fiberglass duct systems combined with flex duct are very restrictive in comparison to metal duct work, causing your fiberglass duct system to be undersized by approximately 12% and your flex duct system to be undersized by approximately 30%. Plus, in most cases, the flex duct system loss is much higher due to the fact of poor installation.