FANS and BLOWERS

Centrifugal fans use a rotating impeller to increase the velocity of an airstream

• True

• False

Centrifugal fans are capable of generating high pressures with high efficiencies

• True

• False

Type of centrifugal fan blade which contains 24 to 64 impeller blades

• a. Forward Curved

• b. Backward Curved

• c. Radial

2. Type of centrifugal fan blade which is applied on applications like boilers, extract ventilation systems, and burner systems

• a. Forward Curved

• b. Backward Curved

• c. Radial

• d. All of the above

Type of centrifugal fan blade which has low to medium airflow rate

• a. Forward Curved

• b. Backward Curved

• c. Radial

• d. Both B and C

An ideal choice to bridge the performance gap between axial and centrifugal fans.

• A. Axial-Centrifugal

• B. Mixed-Flow

• C. Axial Fans

• D. Both A and B

An axial-centrifugal fan has combined features of axial and centrifugal fans with higher pressure than centrifugal fans and a higher flow than axial fans.

• True

• False

A roof ventilation system increases the impact of changing temperatures and moisture conditions both inside and outside the home.

• True

• False

Roof ventilations cause any harm to environment.

• True

• False

Cross flow fans and blowers provide the best solution in instances requiring uniform and broad airflow in limited space combined with high-pressure and velocity at low noise and vibration levels.

• a. True

• B. False