Are these MVHR numbers correct?

[SBMS]

18 minutes ago, JohnMo said:

as I said you need to read building regs, have assumed you are in England. Not sure where your figures align with what BR asks for?

 

From building regs 

Mechanical ventilation with heat recovery

Ventilation rates

1.67 For dwellings using mechanical ventilation with heat recovery, each habitable room should have

mechanical supply ventilation. The total supply air flow should be distributed proportionately to

the volume of each habitable room.

1.68 Mechanical supply terminals should be located and directed to avoid draughts.

1.69 The minimum total continuous rate of mechanical ventilation with heat recovery is the whole

dwelling ventilation rate in Table 1.3

1.70 For dwellings using mechanical ventilation with heat recovery, each wet room should have a

minimum continuous mechanical extract ventilation high rate as given in Table 1.2.

 

Tables are 

 

Sorry typo before. I read the above and worked out that the BR ventilation rate is 124l/s. 
 

43l/s as per your table plus the adjustment as the floor area is greater than 100sqm. 
 

(370 - 100) = 270 m² × 0.3 l/s/m² = 81 l/s
81+43 from the table is 124l/s. Which I think requires a unit size of circa 450 cubic meters per hour. Seems close to the ideal 60% most recommend running a unit at although I wonder if the BR calculation is on the high side. Paul heat recovery calcs just seem a

bit on the low side but I don’t know. 

Edited Friday at 19:50 by SBMS

[JohnMo]

14 minutes ago, SBMS said:

plus the adjustment as the floor area is greater than 100sqm.

So where is that mentioned?

[SBMS]

15 minutes ago, JohnMo said:

So where is that mentioned?

It doesn’t you’re right I was reading someone else’s article on a blog and I don’t think the regs say that. I initially thought it was the greater of 43l/s for 5 bedrooms or 0.3 * square meters floor space. Think i went down a rabbit hole reading someone else’s blog. 
 

I think it’s as simple as 370*0.3=111 as I put originally for BR??