Through roof ventilation systems are an ideal solution to ventilate a space where soffit or wall penetrations are not suitable. 

Flashing for a range of roof types is available including:

• Metal
• Concrete tile
• Clay tile
• Slate roofing

The heavy-duty cowl options enable installation in exposed locations with high winds that may otherwise drive rain into the vent. HDPE and aluminium components mean these kits is suitable for marine use.

Flashing selection to suit the roofing material and slope must be undertaken by the plumber.

Installed system performance is always influenced by duct length and layout.

The acceptable solutions for G4 (G4/AS1) outlines specific extract ventilation requirements in homes. If natural activities or environmental conditions produce any of the types of air pollution outlined in NZBC G4 3.3 , mechanical ventilation is required. 

Additionally; as per table 2 in NZS4303:1990, private dwellings require 0.35 air changes per hour, but no less than 7.5 L/s per person.

For extraction ventilation, table 2 in NZS4303:1990 requires at least 50L/s intermittently or 12L/s continuously for kitchens, 25L/s intermittently or 10L/s continuously for bathrooms. 

As per the E2 Building Code, a roof soaker flasher plate is required for roof penetrations greater than 60mm diameter. Please refer to E2 Building Code for more details.

Manrose through roof kits have proven reliability with decades of experience in the NZ ventilation industry. Our experts have developed the range to include a variety of specialist products, in addition to standard fans, ducts and accessories.

Fan curves are available in datasheets as on the Simx website.

Manrose through roof fan kits provide a 2 year warranty.