best separation between evaporator return side and walk-in wall

[coldseeker2012]

I`ve trying to find a rule of thumb in regards to the best separation (distance) between the return side of a forced air type evaporator and the walk-in freezer wall, so that an efficient air flow is achieved. So far I haven`t been able to get one, but someone told me that the proper distance is about half of the evaporator total width. Does this rule make any sense to you ? Thank you for your responses.

[icemeister]

It depends on what type of evaporator coil (unit cooler) you have and what its manufacturer recommends.

Here's the Heatcraft Unit Cooler I&O Manual (See p.3): http://www.heatcraftrpd.com/products...&O/H-IM-UC.pdf

[coldseeker2012]

Thank you icemeister. I think that my friend`s rule comes from this manual.

[Tommy knocker]

Manufacture spec. I never go less then 18" though. Coil has to be cleaned and I put temp control on back, out of sight out of mind, and I can't focus on anything closer then 4" from my eyes anymore.