Aerosol Injection Port Installation

Part Number 630-701

General

The injection port has been designed to facilitate the injection of aerosol into a ducted air system. It is normally used in conjunction with the ATI Positive Injection Pump and the ATI Thermal or Laskin Aerosol Generator. Sparge pipes may be used to improve the mixing of the injected aerosol. The ports may be installed upstream or downstream of the fan.

For more information, see Fixed Installation Ports & Probes.

Installation Instructions

It is assumed that the installation of the aerosol injection port is to a standard duct of 1.5 mm thick sheet steel.

Tools Required:

• Electric or powerful battery drill with positive drive screw driver bits
• 1.5mm and 3mm HSS drill bits
• Centre punch
• Tape measure
• Hole saw - 40 to 50 mm
• Tube of mastic with mastic dispenser gun
• Positive drive screw driver
• Vacuum cleaner
• Marker pen
• Angle grinder (optional for the removal of any excess screw length)

Procedure

1. Turn off the air handling unit and make it safe for working. Obtain permits as required.

2. Gain access to the duct.

3. Determine a suitable location for the injection port. Generally, it should be mounted as far from the filter as possible.

More than one port may be fitted. Position them equidistant from each other so that the distance from the duct to the first injection port is:

D= H/2N where:

D is the distance from the duct to the center of the first injection port.

H is the total height of the duct.

N is the number of injection ports in a straight line.

The distance between aerosol injection port center is then:

Dp=H/2N where:

Dp is the center distance between the ports.

4. Mark the locations for the centers of the aerosol injection ports.

NOTE: It is very important to locate the ports as far away from the filters as possible.

5. Cut out 40 to 50mm holes at each center location. Take care that the piece cut out is removed from the duct.
6. Locate the aerosol injection port over the hole and mark the four holes for the self-tap screws.
7. Drill 3mm holes for the self-tap screws for each port, using the 1.5mm drill piece to pilot the hole.
8. Apply mastic to each flange base in turn and secure the flange in position. Wipe off excess mastic.
9. If necessary, remove any excess screw length on the inside of the duct with an angle grinder. This is to avoid injury from sharp ojects
10. IMPORTANT: Vacuum up all swarf/metal shavings to prevent later damage to the filters.
11. Fit the screw cap to close off the injection port.

 This completes the installation.