happyfolk

@Blooda Really, you think it wasn't commissioned correctly, that was my fear. I thought such things were happening 10 years ago, not now! What makes you think the figures are too good? Unit: Vent Axia 443319 Sentinel Kinetic Yes I can access the unit for maintenance. But not the ducting @JohnMo Thanks very much for the detail on how to take the velocity. The only information I have is the equipment used was a Testo 417 Anemometer with 100mm Vane. The method is not detailed. I will ask the person responsible for the ductwork if there are orifice plates to control the flow rates. Last time I spoke with them, they wanted to charge a full days rate to measure the extract and inflows, because of the type of apertures! But then I heard nothing back from them

@ProDave sounds like you're setup is doing you well. Does it ventilate entirely, or do you still open windows? Sounds like your full boost is called "purge" mode on my system which runs 100% for a set time, is indeed a bit noisy. @Blooda yes your red arrow; the outlet is in there with the AC grills, all lumped together, can't use a cone style anemometer to measure. I open the windows for ventilation sadly. Here's the extract and inflow figures. Regular continuous was at 50% and boost 75%. I guess it passed the BR on boost 75% for the extract Do you think these figures make sense? thanks everyone!

thanks !! Interesting that boost should be about 25% more airflow. Not 100% more like on the cert You would assume the flow rates were setup properly at commissioning but you never really know. I have tried to get it commissioned again but not a single company I contacted wants to work with this design. The inflow/extract points are not just mushroom style but ski-sloped (to make it look pretty i guess). Even the company recommended by Vent Axia do not work with this style. There is exactly one mushroom style vent but that's in the utility cupboard, wonder if it's worth measuring that as a baseline for the rest of the setup. For the rest (see pic): I guess you would block the whole opening to take a reading. Any ideas how you would go about measuring these flow rates? Feels a waste having to have the windows open many thanks!

Hi everyone, I was wondering if someone (maybe someone keen with an anemometer) has measured what difference boost mode makes to supply and extract with their MVHR. I have a bog standard Vent Axia that I run on either 50% or boost which is 75% according to the initial commissioning boost can 2x the air supply. Seems a bit punchy! I generally have the windows open and I'm not too confident this system is working. Was wondering if these numbers make sense? thanks everyone!