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VENT Circular Soffit Vents G700

The VENT Circular Soffit Vent (G700) Vents can be utilised for new build and refurbishment projects. The G700s are an easy retro fit solution for existing soffits on both skillion and trussed roof designs with condensation problems.

Standard fixing for this product is a simple push twist action into a 70mm hole drilled in the soffit board. The G700 are designed with 4mm evenly spaced openings specifically sized to prohibit large insects gaining access but wide enough to prevent capillary action.

This product should be used in conjunction with the VENT Eaves Vent (EV25) or VENT Roll Rafter Tray (G502) to ensure ;continuous airflow into the roof void.

The G700 comes in white, black or brown colours.

Key Features
  • Provides continuous airflow at eaves
  • Simple 'push fit' installation
  • Compatible with any soffit product
  • Prevents the ingress of nesting insects
  • Designed not to retain water droplets
  • 30 year warranty
Scope of Use

Suitable for use in new and existing buildings within the following scope:

  • Up to 10m in height, and
  • With a risk score of less than 20, when evaluated against the E2/AS1 risk matrix, and
  • In wind zones up to extra high as defined in NZS 3604:2011, and
  • In all corrosion zones as defined in NZS3604:2011

Whilst the G700 is predominantly used on residential it can easily be used on commercial buildings where buildings show signs of condensation and air quality problems.

  • Can be used on truss or skillion roofs
Limitations on Use

The G700 is a method of ventilating the eaves/soffit area of a roof only and should be used in conjunction with the VENT Eaves Vent (EV25) or VENT Roll Rafter Tray (G502) to ensure ;continuous airflow into the roof void.

NZS 3604 Wind Zone Extra High suitable
Extra High Wind Zone
Statement of Building Code Compliance

Vent Passive Roof Ventilation Products comply with the following provisions of the NZ Building Code:

  • B1 Structure: 1.3.1, B1.3.2, B1.3.3(a), B1.3.4 (a, b, c, d, e)
  • B2 Durability: B2.3.1(a), B2.3.2(a)  

All products are manufactured by Manthorpe Building Products Ltd (UK) who are ISO 9001 accredited by SGS Certificate # GB12/84769, certified since 2011.

In-Service History

The G700 Circular Soffit Vent has been designed to meet the requirements of BS5250, Control of Condensation in Buildings and has been in continuous manufacture and supply to the USA, Canada and UK building industry for over 20 years.

Other Performance Attributes
  • 30 year warranty
Product Technical Statement
Circular Soffit Vent
Passive Ventilation System: Retro Roof Pitch 15-30°
Product Information and Installation: G700
CAD/PDF Details
Full Set of Roof Drawings


20 Retro Fit or New Build

20 Eave EV25 and G700

VENT provide complete passive ventilation systems that ensure healthy homes free from internal moisture and condensation.

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