Frequently Asked Questions

Should the Software used for F280-12 Calculations be Verified?

Yes. Canadian Building Codes require the use of CSA F280-12 to determine heating and cooling equipment capacity. The current CSA F280-12 standard contains the following sentence: 8.1.2.(a) Software systems that claim to conform to the CSA F280 calculation procedure shall be verified according to the procedure set out in Clause 8. (Clause 8 is the verification section of the Standard).

(Ontario Specific) Should the Airtightness Value (ACH50) used for the F280 Calculation be the same as that entered on the SB12 EEDS Performance Form?

No. The airtightness value (ACH50) used in the F280 Calculation does not have to be the same
as that entered on the SB12 EEDS Performance Form, but if it is different, the F280 value should
always be higher than the SB12-EEDS value.

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