Another high efficiency furnace installation by Verne & Ellsworth Hann and another customer who is happy with the quality of his new system as well as the professionalism used during the project. But what is the gray material on the supply ductwork on the right? We are getting that question more frequently. And it all has to do with efficiency and the building code enforced by the municipality in which you live.
As national building codes become more diligent about efficiency in all phases of homebuilding additional scrutiny is given to even the smallest facets. In this particular case the focus is on even the most minimal air leakage from the return air ducts to the furnace. In essence, if every seam and connection of the return ductwork in completely sealed, then there will be no air drawn in from the basement. The system becomes more efficient. Efficiency translates into less energy consumed and more energy dollars saved.
Most energy-conscious and code abiding installers seal ducts with a gray mastic. Gray because it’s close in color to sheet metal. Mastic is a pliable material that goes on soft and then hardens. it’s applied liberally in order to ensure it gets worked into all of the air gaps in the seams and joints.
To be clear, National Building Standards are often adopted by state building codes which, in turn are adopted by local municipalities. Not all municipalities enforce all of the codes. That is up to the discretion of that particular building department.
But, as the push towards greater efficiency increases, more municipalities are demanding compliance from the contractors who perform work in their cities.
Verne & Ellsworth Hann is up to speed with all of the building codes in all of the municipalities in which we work. As an educated consumer seeking multiple estimates for a new HVAC project, you need to be asking your contractor about his code compliance awareness and history.
For a more detailed reading of the building code as adopted from the Ohio Mechanical Code by the Board of Building Standards you can read the complete code standard chapter 4101:8-16-01 on Duct Systems here. Paying particular attention to sections 1601.4.1 through 1601.4.7 on joints and seams.
That’s a lot of detailed information to digest in order to understand why the installer is painting a gray substance onto the new ductwork of your new high efficiency furnace.
But rest assured that Verne & Ellsworth is familiar with all codes in all municipalities.
- Richard & Rita G.( Cleveland Heights, Plumbing Repair, February 2020 )
Brian was an excellent worker. He was clear about the problem, worked efficiently and neatly.
- Debby D.( Shaker Heights, Boiler Installation, December 2019 )
The installers were really easy to have in the house. Super guys.
- Gail B.( Chagrin Falls, Furnace & Air Conditioning Installation, August 2019 )
Efficient – no nonsense!
- Diane H.( Mayfield Heights, Mini-Split Installation, December 2019 )
To all of you, thank you for your professionalism and work ethic. It was a pleasure to have you in my home to install units.
- Richard K.( South Euclid, Boiler Installation, November 2019 )
Great leader in Todd and great team. Everything was very well done. Very impressed with Todd’s 40 years of work at Verne & Ellsworth Hann.