Ideal vogue max 32 22mm in pipe

[Chrizz81]

Hi I have just had a Ideal Vogue 32 boiler and the main gas pipe in is 22mm. There is then a branching 15mm pipe going off the 22mm and into the boiler.

Is this legal as I thought all in pipes had to be 22mm?

Thanks

 

[cross thread]

If it’s delivering the correct volume of gas it’s correct