The cover can be attached to the duct to prevent dust and other intrusion.
Flexible and flexible lighting can be used according to the space.

From the Manufacturer

	Panasonic Lighting Fixture Wiring Shop Line Duct Body 3.3 ft (1 m) Black	Panasonic Lighting Fixture Wiring Shop Line Duct Body 6.6 ft (2 m) Black	Panasonic Lighting Fixture Wiring Shop Line Duct Body 4.3 ft (1.345 m)
Model No.	DH0221	DH0222	DH0229
Color	Black	Black	Black
Size:	1m	2m	50 feet

	Panasonic Lighting Fixture Wiring Shop Line Duct Body 3.3 ft (1 m) White	Panasonic Lighting Fixture Wiring Shop Line Duct Body 6.6 ft (2 m) White	Panasonic Lighting Fixture Wiring Shop Line Duct Body 4.3 ft (1.345 m) White
Model No.	DH0211	DH0212	DH0219
Color	White	White	White
Size:	1m	2m	50 feet

	Panasonic Lighting Fixture Wiring Shop Line Duct Body 3.3 ft (1 m) Silver	Panasonic Lighting Fixture Wiring Shop Line Duct Body 6.6 ft (2 m) Silver	Panasonic
Model No.	DH0201	DH0202	DH0209
Color	Silver	Silver	Silver
Size:	1m	2m	50 feet