Developed "Luftain Tg" to include cage and luck for the breeding, nowadays an experiment increases as exchanging it digest gene set, and breeding, experiment of Transgenic mouse (following Tg mouse) increases. Doesn't exit the front of luck to outside as giving and doing a mind directly to cage inside, as a ceremony as hanging bathtub type cage-we controlled with a curtain and developed a system to defend from an expansion of cage inside and outside contamination. Again, for flowing of these air computer simulation even though were able to confirm it.