How to know the difference

[Steven B]

The 1980 catalogue has the answers you need:

https://www.ness-st.co.uk/pdf/Farish 1980 Catalogue.pdf

 

2304 = single vent GWR

2404 = twin vent GWR

[rab]

4 hours ago, Kris said:

I think that the single vent was 2304.

I suspect that I have some boxed in the loft somewhere.

Thanks @Kris .

 

I've googled 2304 and it does indeed

show the single vent version.

 

I was trying number either side of 2404,

(2403, 2405), but I guess I was being too logical. :)