Carrier 42QHP09E8S Service Manual page 32

Procedure
5) Open the horizontal louver and push
the hook towards right to open it (see
CJ_OP_INV_003).
6) Bend the horizontal louver lightly by
both hands to loosen the hooks, then
remove the horizontal louver (see
CJ_OP_INV_004).
Note: This section is for reference only. Actual unit appearance may vary.
 Page 28 
Illustration
Horizontal Louver
CJ_OP_INV_003
CJ_OP_INV_004
Hook
Hook