use gm_spawn MODELPATH to spawn them, or if you have hl2 mounted, go to props_wasteland
Long Fence: models/props_wasteland/exterior_fence002e.mdl
Slim Fence with Roof: models/props_wasteland/interior_fence001a.mdl
Small Fence with Roof: models/props_wasteland/interior_fence001b.mdl
Medium Fence with Roof: models/props_wasteland/interior_fence001c.mdl
Normal Fence with Roof: models/props_wasteland/interior_fence001d.mdl
Slim Fence: models/props_wasteland/interior_fence002a.mdl
Small Fence: models/props_wasteland/interior_fence002b.mdl
Medium Fence: models/props_wasteland/interior_fence002c.mdl
Corner Fence: models/props_wasteland/interior_fence002f.mdl
Long Fence: models/props_wasteland/exterior_fence002e.mdl
Slim Fence with Roof: models/props_wasteland/interior_fence001a.mdl
Small Fence with Roof: models/props_wasteland/interior_fence001b.mdl
Medium Fence with Roof: models/props_wasteland/interior_fence001c.mdl
Normal Fence with Roof: models/props_wasteland/interior_fence001d.mdl
Slim Fence: models/props_wasteland/interior_fence002a.mdl
Small Fence: models/props_wasteland/interior_fence002b.mdl
Medium Fence: models/props_wasteland/interior_fence002c.mdl
Corner Fence: models/props_wasteland/interior_fence002f.mdl