Conditional Formatting to filter out blank values

Hi, I have a very simple table which looks like below, which counts the amount of entries against each H1, H2, etc.

I am filtering it via a category, which in my case, is farms. Not all farms have 6 houses, so I have used conditional formatting to filter it to the below when the value is 0:

My question is, how would I also go about blocking out H4, H5 & H6 in this example? But also for any other values that are zero, also make text and background white for the houses?

As always, any help much appreciated.
Greg_Deckler PhilipTreacy amitchandak 

Dan