Cirrus DESIGN SR22 Pilot Operating Handbook page 312

Section 9 Cirrus Design
Supplements SR22 / SR22T
Section 1 - General
The airplane is equipped with an Ice Protection System. This system
allows a pilot who inadvertently enters icing conditions, to initiate de-
icing fluid flow along the wing, horizontal stabilizer, and propeller
blades.
Section 2 - Limitations
The Ice Protection System is certified only as "No Hazard" to normal
operations, therefore, no determination has been made as to the
capability of this system to remove or prevent ice accumulation
1. Flight into known icing is prohibited.
2. Deicing Fluid must meet British Specification DTD 406B.
2 of 20 P/N 13772-115
Revision 10: 09-20-12