Volume flow controller VRF Vent

Overview
The VRFvent volume flow controllers control constant or variable volume flow in rectangular air ducts of Comfort Air Technology systems independently of inlet pressure. A full barrier can be implemented. Actuation and control use external energy (electric or pneumatic). Housing cross-sections follow recommended edge lengths per DIN EN 1505 to maximise flow cross-section in compact installations.

Key features

• High control accuracy and energy saving potential – flow-optimized two-stage nozzle with minimal pressure loss for high effective pressures even at low air velocities (VenturiControl principle).
• Universal – suitable for mounting various controller makes/components.
• Combination options – compatible with spring return or high-speed drives.
• Measurement modes – available for dynamic (VRFvent) and static measurement (VRFvent-s).
• Easy to adjust – can be retrofitted on site; damper position readable from the outside.
• Simple installation – using flanges with slotted holes (or sliding cage nuts for insulated version).

Technical data summary
Technical data for LpA = 35 dB(A): Volume flow examples: 70 m³/h and 200 m³/h (see datasheet for full range). Differential pressure range: up to 1000 Pa.

Dimensions (Length x Width x Height in mm)
200 x 100-1200 x 400

Design / Options

• Static version (for polluted air) — optional
• Insulating shell — optional
• Silencer accessories — optional
• Housing: galvanized steel
• Measurement principle: dynamic (for unpolluted air) and static

Application & operation
The product applies LTG's VenturiControl principle to achieve low pressure loss combined with high accuracy. It is designed for rectangular air ducts and supports external actuation (electric or pneumatic). Use where independent control of volume flow from inlet pressure is required; a full barrier can be realised if needed.

Technical specifications

• Measurement principle: VenturiControl; dynamic (VRFvent) and static (VRFvent-s).
• Actuation: external energy (electric or pneumatic).
• Volume flow: examples 70 m³/h and 200 m³/h; see datasheet for complete range.
• Differential pressure range: up to 1000 Pa.
• Dimensions (L x W x H): 200 x 100-1200 x 400 mm.
• Options: static version, insulating shell, silencer accessories.
• Housing material: galvanized steel.
• Standards: housing cross-sections comply with DIN EN 1505.