Every map that supports the SyC gametype has a killroom. The killroom is where the player gets killed with no ways of escape. Killrooms were added to balance out the game so that people won't hide in the Spray Rooms. To access the killroom of a map, the player must go to the spray room and stay there for around 20 seconds. Then the announcer will say "You have 10 seconds to leave this room" and a countdown begins. Once the 10 seconds are up, the player is instantly teleported to the special killroom where they die and loose everything.
The reason the time that a player can stay in a Spray Room for 30 seconds instead of 10 is unknown. Probably because some Spray Rooms are big and even have powerups in them (e.g. the Spray Room in PadShop has a visionless hidden inside)