Hometech Provides Extract Ventilation for Kāinga Ora Project

Busby Street is a three-storey, two block structure housing 18 two bedroom units, commissioned by Kāinga Ora.

Kāinga Ora’s Innovation Team’s aim is to speed up the build time for their social housing projects. Their key objective is to design a structure using pre-fabrication, where possible, in order to have a build time of 12 weeks — from foundation to completion.

In order to complete the Busby Street build within a 12-week timeframe, the solution was to include pre-fabricated options. Having used off-site manufacturing on a previous Clayton Avenue site where timber paneling was constructed off-site, the decision was made to increase the level of off-site manufactured components. Therefore, with the Busby Street project the design included the construction of bathroom pods. The pods were built by Concision, an off-site manufacturer based in Canterbury, and transported to Auckland for installation.

Hometech provided the specifications and dimensions of the products that were requested and the size and location for holes that needed to be pre-cut into the slabs for the bathroom/laundry ceiling diffusers. The ceiling diffusers were pre-installed in the pods in Christchurch while the fire dampers and ducting were slotted into place on site at Busby Street. The ducting was dependent on which storey the unit was located, with vents via the external wall or roof.

This also applied to the Hometech supplied and installed rangehoods in the kitchens for the 18 units.

“Hometech’s extract systems in bathrooms were specifically designed to fit the ‘pods’. And we worked closely with the Hometech team to ensure the ducts were in the right place for the ‘pods’," says Michael Brinkley, Miles Construction Ltd.

Extract systems supplied for the bathroom pods:

12x Custom Bathroom/Laundry Extract systems
6x Rangehood installation via roof
6x Dual extract fans (VS3003) via roof

Plus 12 x Custom Rangehood Extract systems for the kitchens.

Kitchen Ventilation System Through Roof

Hometech

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A rangehood system for kitchen ventilation, installed through the roof with up to 3m of 150mm ducting.

Single room, kitchen extraction
Through roof, vertical exhaust
Primarily for single storey

Installation:

Diameter: 150mm
Duct run: up to 3m

Meets the following provisions of the NZBC:

E2: External Moisture
G4: Ventilation

Healthy Homes:

Extraction air volume exceeds 50l/s for kitchens

BRANZ Appraised roof penetration:

Appraisal No. 665 [2017]

BRANZ Appraised

Bathroom Ventilation System Through Wall via Bulkhead

Hometech

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A ceiling or wall mounted extraction fan system for bathroom ventilation, ducted up to 3m through bulkhead or mid floor to exterior wall.

Options for up to 2 rooms
Ground or mid-floor installations
Bathrooms, toilets, laundries
Extract though bulkhead or mid-floor

Installation:

Diameter: 150mm
Duct run: up to 3m
Fire protection available that is compliant to AS/NZS 15304.4:2014

Meets the following provisions of the NZBC:

B2: Durability
E2: External Moisture
G4: Ventilation

Healthy Homes:

Extraction air volume exceeds 25l/s for bathrooms, and/or 40l/s for laundries

Fire:

Fire protection available that is compliant to AS/NZS 15304.4:2014

Continuous Extract System Through Roof with In-line Fan for 1-4 Rooms

Hometech

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A continuous extraction system installed with a roof-mounted exhaust with an in-line EC fan.

Homestar / Green Star

Multi-room continuous extraction for always on ventilation

Ideal for:

Typically from bathrooms or other wet rooms but can be straight from bedrooms and living spaces
Fresh air volume suitable for:
- up to ~100-200m² house (1-3 Rooms)
- up to ~100-150m² house (4 Rooms)

up to ~100-200m² house (1-3 Rooms)
up to ~100-150m² house (4 Rooms)

Installation:

Roof mounted system installed with proprietary roof flashing (BRANZ Appraisal 665) and vent cap
Fire protection available that is compliant to AS/NZS 15304.4:2014
Diameter:
- 150mm (1-3 Room)
- 150-200mm (4 Room)
Duct Run:
- 1 Room: Up to 3m (acoustic duct)
- 2-3 Rooms: Up to 3m per run (acoustic duct), maximum 6m separation between rooms
- 4 Rooms: Up to 3m per run (acoustic duct), maximum 10m separation between furthest rooms
Roofline Clearance:
- 1 Room: Minimum of 350mm between ceiling and roof line is required
- 2-4 Rooms: Minimum of 500mm between ceiling and roofline is required

150mm (1-3 Room)
150-200mm (4 Room)

1 Room: Up to 3m (acoustic duct)
2-3 Rooms: Up to 3m per run (acoustic duct), maximum 6m separation between rooms
4 Rooms: Up to 3m per run (acoustic duct), maximum 10m separation between furthest rooms

1 Room: Minimum of 350mm between ceiling and roof line is required
2-4 Rooms: Minimum of 500mm between ceiling and roofline is required

Meets the following provisions of the NZBC:

B2: Durability
E2: External Moisture
G4: Ventilation

Healthy Homes:

1-2 Rooms: Extraction air volume exceeds 25l/s for bathrooms, and/or 40l/s for laundries
3 Rooms: Extraction air volume exceeds 25l/s for bathrooms

Fire:

Fire protection available that is compliant to AS/NZS 15304.4:2014

BRANZ Appraised roof penetration:

Appraisal No. 665 [2017]

BRANZ Appraised

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