The ornamental design for a spiralairguidecover, as shown and described.
FIG. 1 is a front perspective view of a spiral air guide cover showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right elevational view thereof;
FIG. 5 is a left elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is another perspective view thereof, with the air pump engaged.
The broken lines shown in the drawings are for the purpose of illustrating environmental structure and portions of the article that form no part of the claimed design.