Sherman M.
The residential ventilation market is changing rapidly in the United States.
Dwellings are going from having no designed ventilation systems to have to meet specific requirements.
The drivers are local codes and large scale programs being implemented by states and utilities and the federal government.
Residential ventilation products are adapting to meet the evolving needs of the market.
New products are coming out frequently and presumably more are in development.
By contrast the market for nonresidential ventilation is reasonably mature.
