**R302.5.3 Other penetrations. **Penetrations through the separation required in Section R309.2 shall be protected as required by Section R302.11, Item 4.
- At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an *approved *material to resist the free passage of flame and products of combustion. The material filling this annular space shall not be required to meet the ASTM E 136 requirements.
**R302.6 Dwelling/garage fire separation. **The garage shall be separated as required by Table R302.6. Openings in garage walls shall comply with Section R302.5. This provision does not apply to garage walls that are perpendicular to the adjacent *dwelling unit *wall.
**R302.5.2 Duct penetration. **Ducts in the garage and ducts penetrating the walls or ceilings separating the *Dwelling *from the garage shall be constructed of a minimum No. 26 gage (0.48 mm) sheet steel or other *approved *material and shall have no openings into the garage.
Carpet transition should have been used.
Or something like this;
The carpet should be cut in the center of the door so when door is closed neither flooring on other side of doorway will show. Check with your local dealer.
Usually an annodized alluminum strip is intalled at the time of the ceramic tile installation for carpet transitions to carpet.
Last, I think a nest of little varments is evident.