The terms "glasshouses" and "growth-room" refer to a structure with walls, a roof and a floor designed and used principally for growing plants in a controlled and protected environment.

All provisions of Table I A shall apply with the following additions/modifications:

Specifications	Containment levels
	1	2	3	4

Building

1

Greenhouse: permanent structure (1)

Not required

Required

Required

Required

Equipment

3	Entry via a separated room with two interlocking doors	Not required	Optional	Optional	Required
4	Control of contaminated run-off water	Optional	Minimise (2) run-off	Prevent run-off	Prevent run-off

System of work

6	Measures to control undesired species such as insects, rodents, arthropods	Required	Required	Required	Required
7	Procedures for transfer of living material between the glasshouse/growth-room, protective structure and laboratory shall control dissemination of genetically modified micro-organisms	Minimise dissemination	Minimise dissemination	Prevent dissemination	Prevent dissemination

(1) The glasshouse shall consist of a permanent structure with a continuous waterproofed covering, located on a site graded to prevent entry of surface-water run-off having self-closing lockable doors.
(2) Where transmission can occur through the ground