Perforated Diffuser

Model: PF

Perforated Diffuser
  • Perforated Diffuser

Perforated Diffuser

Standard Overall Size :   594 x 594 mm, 594 x 1194 mm
Recommended Air Flow Range (cmh): 100 - 2100 cmh

Description        :

Connols-Air Model P and PM perforated diffuser is constructed of square/rectangular steel perforated face with a round adjustable disc hidden behind that achieve uniform 360° distribution. The disc acts as damper for throttling of air volume.  The design of the perforated diffuser provides horizontal air distribution even when it is mounted without ceiling.  It is designed for installation with and without ceiling at height of 2.5 m to 3.5 m.  The diffuser is commonly installed surface-mounted on plaster ceiling and inverted Tee-bar ceiling system. With inverted Tee-bar ceiling, the diffuser is available with overall size of 594 X 594 mm or 1194 X 594 mm for lay-on the Tee bar of grid size 600 X 600 mm or 1200 X 600 mm.  The perforated diffuser inlet size ranges from 150 to 350 mm to handle airflow ranging from 200 CMH (56 l/s) to 865 CMH (240 l/s).  Installation on other ceiling is possible, please consult our factory. 

For perforated diffuser connected to flexible duct, a straight duct length of 2 equivalent diameters is recommended before the connection.  Perforated diffuser may be supplied with engineered plenum to ensure uniform air distribution.  The engineered plenum may be supplied with an inlet damper, equalizer and fire retardant acoustic foam to reduce upstream noise.  As a standard, the engineered plenum is supplied with different inlet spigot ranging from 150 to 200 mm and can handle air flow ranging from 100 CMH to 450 CMH (125 l/s). 

The perforated diffuser face is attached to the aluminium frame with spring clips and is easily removed for cleaning without special tool. The diffuser is available in standard powder coated baked white enamel RAL 9010.  Other finishes are available upon request.


  • Perforated face plate easily removed for cleaning
  • Square/rectangular face with horizontal 360-degree air distribution
  • Engineered plenum ensures uniform air distribution
  • Low generated sound level
  • Low ceiling space required
  • Matching return perforated diffuser available