Measure at least 1" beyond pipes and valves on both ends. Make length
you enough room for fit and balance.
Measure from floor to top of radiator. Add at least 1".
Leave ample room both in front and in back of radiator
certain enclosure can be slipped over the top of the radiator since they
have partial backs (which can be modified as needed).
Never order a radiator enclosure that is exactly the same size as your
radiator, or a smaller size. Make sure the size you order is at least
1 inch longer, 1 inch higher, and 1 inch deeper than your radiator
(2" deeper for certain models).