Type VFL

Provides constant volume regulation of delivered airflow rate regardless of inlet static pressure variations

  • 5 Nominal Sizes from 4″(100 mm), 5″(125 mm), 6″(150 mm), 8″(200 mm), 10″(250 mm)
  • Casing and damper are of galvanized steel construction
  • Control component: manual operation
  • Casing and damper are of UL94V1 plastic, UL 2043 Standard for Fire Test for Heat and Visible Smoke Release for Discrete Products

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SKU: VFL Category: Tag:

Description

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VOLUME FLOW LIMITER FOR INSERTION INTO DUCTING

Circular, mechanical self-powered controllers for insertion into round duct-work

Product Features

  • Provides constant volume regulation of delivered airflow rate regardless of inlet static pressure variations
  • Unit operates independent of gravity and may be installed in any (horizontal or vertical) orientation
  • Require no external power source and are virtually maintenance free
  • Unique damper blade edge for acoustic optimization
  • Simple, easy and quick balancing and commissioning on site
  • Range of volume flow rate set-points for each nominal size
  • Controlled volume flow rate is field adjustable by means of a calibrated dial on the side of the unit
  • Best accuracy among controllers for insertion

Technical Data

  • 5 Nominal Sizes from 4″(100 mm), 5″(125 mm), 6″(150 mm), 8″(200 mm), 10″(250 mm)
  • Flow rate range:
    • 4″ = 11 to 72 CFM
    • 5″ = 23 to 115 CFM
    • 6″ = 30 to 155 CFM
    • 8″ = 55 to 312 CFM
    • 10″ = 93 to 450 CFM
  • Controllers operate from 0.12 to 1.2 inches H2O differential static pressure
  • Minimum differential pressure: 50 Pa or 0.2″ wc
  • Maximum permissible differential pressure: 300 Pa or 1.2″ wc
  • Suitable for low airflow velocities from 150 Feet per minute
  • Control component: manual operation

Construction Details

  • Casing and damper are of UL94V1 plastic, UL 2043 Standard for Fire Test for Heat and Visible Smoke Release for Discrete Products
  • Control spring is stainless steel
  • Internal pressure regulation diaphragm is of polyurethane.

Literature Downloads

VFL Product Brochure

VFL Installation and operating manual

Sales flyer Type LVC, TZ-Silenzio, TA-Silenzio, VFL

Additional information

Size

4 inch, 5 inch, 6 inch, 8 inch, 10 inch