Furnace Blower CFM and BTUH Delivery to the Home

In my recent internet travels I have seen multiple references to a simplified (reduced) "general" formula that states:
BTUH = CFM x Delta-T x 1.08

This can be rearranged to read:
CFM = BTUH/(Delta-T x 1.08)

Using it in this rearranged format, and solving for various furnace output BTUH's you can calculate the (minimum?, maximum?, ideal?) CFM requirements for your furnace blower.

For the case of the cold air return being a nominal 65 degrees and if you are heating the air to a top level of 130 degrees, then your Delta-T is 65 degrees. If I'm applying this formula correctly, then:

For 50,000 BTUH output:
CFM = 50,000/(65 x 1.08)
blower CFM requirement = 712

For 75,000 BTUH output:
CFM = 75,000/(65 x 1.08)
blower CFM requirement = 1,068

For 100,000 BTUH output:
CFM = 100,000/(65 x 1.08)
blower CFM requirement = 1,425

Does this appear to be a correct application of this simplified formula?