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MVHR First Fix
Inspection & verification form
Site information
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Site contact
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MVHR design reference
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MVHR designer
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Site specific notes
Hard to find, no parking, big dog etc..
Critical components
Are the exterior roof/exterior vents installed at least 1.5m apart?
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Yes
No
Other
These should be on the same elevation and not downwind from flues or chimneys
Are all manifolds secured properly in the location shown on the design?
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Yes
No
Other
Moving a manifold with 10 pipes by 1m means you need at least 10m more ducting
Are the inspection hatches on each manifold accessible for servicing?
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Yes
No
Other
One day you'll need access inside the manifolds for duct cleaning purposes
Are there any tight bends in the radial at the connection to the manifold?
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Yes
No
Other
Tight bends put the joint and the sealing ring under stress so they could eventually fail
Have all ceiling plenums been installed in the location given on the design?
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Yes
No
Other
Small adjustments are okay provided they are at least 400mm from an adjacent surface
Are ceiling plenums mechanically fixed (i.e. solid) and straight vertically?
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Yes
No
Other
If the plenum is not straight vertically the air valve may not fit securely
Do the radial duct runs follow the design in both location and quantity?
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Yes
No
Other
Bends add turbulence, pressure, and noise. Sweeping bends offer better laminar flow
Where shown on design, are two radial pipes connected to the same ceiling plenum?
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Yes
No
Other
Check design - kitchens, bathrooms, and living spaces may be ‘twin piped’
If specified, are fire collars and/or mechanical dampers installed correctly?
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Yes
No
Other
Building Control may ask for evidence so we recommend you take photos as necessary
Please take photos
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show fire protection snags that need attention
If the MVHR system includes a NOx filter is it somewhere serviceable?
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Yes
No
Other
An access hatch in the finished ceiling or wall may be needed for replacing filters
Please take photos
Drag and Drop (or)
Choose Files
show areas you think may need an access
Radial ducting
Has the radial ducting been cut square at both ends with no burrs?
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Yes
No
Other
Off-square cuts can affect the sealed joint and rough edges collect dust
Please take photos
Drag and Drop (or)
Choose Files
show rough ends
Is there 500mm of straight ducting before the connection to the ceiling plenum?
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Yes
No
Other
Tight bends very near the outlet create turbulence and unwanted noise
Please take photos
Drag and Drop (or)
Choose Files
show tight bends
Are the black rubber sealing rings fitted to the 2nd recessed ridge?
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Yes
No
Other
Rings on the first ridge of the radial duct can cause leaks if pipe is not straight
Please take photos
Drag and Drop (or)
Choose Files
show examples
Are two red retaining clips fitted to EVERY spigot that holds a radial duct?
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Yes
No
Other
The radial duct needs securing on both sides to stop it pulling out
Please take photos
Drag and Drop (or)
Choose Files
show examples
Do the radial duct runs have unnecessary tight bends, crossovers, or crushes?
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Yes
No
Other
Bends add turbulence, pressure, and potentially noise. Wide sweeping bends are best
Please take photos
Drag and Drop (or)
Choose Files
show tight bends, crossovers, or crushes
If radial couplers are used, are they installed on a tight bend?
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Yes
No
Fitting them on a tight bend can cause air leakage over time
Please take photos
Drag and Drop (or)
Choose Files
show radial connectors on a tight bend
Are the ducting risers (through floors) in the location designed?
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Yes
No
Other
Fire dampers or collars may be required if the riser penetrates a fire-resisting barrier
Please take photos
Drag and Drop (or)
Choose Files
show any risers in the wrong location
Is the radial ducting secured with a zip tie or banding every 600 – 1200mm?
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Yes
No
Other
Radial ducting can wobble or vibrate if not secured properly. If in doubt add more banding
Please take photos
Drag and Drop (or)
Choose Files
show examples
If the MVHR supports cooling has all supply-side ducting been fully insulated?
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Yes
No
Other
Insulation needs to run from spigot to spigot covering the supply manifold too
Please take photos
Drag and Drop (or)
Choose Files
show any gaps in the insulation
Where plenums are ‘single piped’, does the spare spigot have a blanking cap?
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Yes
No
Other
Make sure the blanking cap is well fixed. If it comes off you’ll be ventilating the floor void
Please take photos
Drag and Drop (or)
Choose Files
show any uncapped spigots
Has a smoke test been carried out to check for leaks in the radial ducting?
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Yes
No
Other
With caps on and manifolds sealed a smoke pellet can be used to check for leaks
Please take photos
Drag and Drop (or)
Choose Files
show examples
Hygiene & protection
Do ALL installed ceiling plenums have a temporary dust cap fitted?
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Yes
No
Other
These push-in caps keep building dust & debris out of the sterile ducting until second fix
Please take photos
Drag and Drop (or)
Choose Files
show at least one missing dust cap
Have the large spigots on the manifolds been taped to prevent dust ingress?
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Yes
No
Other
We recommend sealing the manifolds with duct tape until the machine is installed
Please take photos
Drag and Drop (or)
Choose Files
show the un-taped spigots on the manifolds
If mass flow ducting is installed at first fix, has it been properly secured?
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Yes
No
Other
Mass flow ducting needs to be supported so it is not hanging by its own weight
Please take photos
Drag and Drop (or)
Choose Files
show any unsupported mass flow ducting
If mass flow ducting is connected to the manifolds, is it secure?
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Yes
No
Other
When in their final position the these connections should be glued and strapped
Please take photos
Drag and Drop (or)
Choose Files
show any problematic mass flow connections
Finishing off..
Your name
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Date of inspection
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Is the site manager aware of other trade requirement ahead of plaster boarding?
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Yes
No
Other
Plumber for condensate, electrician for power & control cables, datapoint etc.
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