equipment does the tech use? The tech uses
several pieces of equipment. He/she will set up a "blower
door" over the doorway that blows air into the
house, increasing the air pressure inside the house.
This measures the amount of air the house is losing.
will attach a "duct blaster" to the
ductwork at the furnace or air conditioning unit.
This is used to pressurize or de-pressurize the duct
system to equalize the air pressure in the house to
the air pressure in the ductwork. Sensitive gauges
then measure the amount of air lost to the outdoors.
These devices also measure pressures to assure there
is no negative air pressure in the house, which can
cause combustion appliances to back draft.
sort of sealants are used and are they safe for
people and animals?
are sealed with special mastics designed to last
for many years. The mastics are water based and
are safe for people and animals. When fresh, it
can be cleaned
with water. The mastic dries to a hard finish.
It is messy when wet, so assure children and
animals should be kept away until the duct is
covered with the register cover. After sealing,
the tests will be performed again to assure all
possible leaks have been sealed.
Will the crossover be
Double and triple wide mobile homes have a
crossover that joins the ducts on each side
together. Frequently the crossover has become
disconnected or leaky. It will be repaired,
reconnected and sealed if possible. If it needs
replacing, there could be a charge for purchasing
the new crossover.