Fumigation

No idea why they call it such but this is the first time I've seen people doing a safety check for the biosafety cabinet. So, this is what you need to do.
1. Come with lots of sticky tape and big plastic bags.
2. Stick the plastic bags over the hood, wrap it up like you are Santa Claws.
3. Use lots of tapes, use as if your father owns the factory.

4. Please remember to forget to put in the smelly ammonium thingy into the hood so you can (after using lots of tape to secure the plastic bags in place) make a mess out of the whole thing by trying to put this tupperware of thing into the hood right after you sealed it moments ago.

5. Do also stick platic bags and sticky tape on the top of the cabinet. But remember that you forgot to put the ammonia thingy till just now? Enjoy the whiffs of scented air now.

6. Leave the lab to the rightful owners overnight. Dont hog the ammonia for yourself.

7. Come back the next morning with a smell-o-sensor and a big vacuum cleaner.

8. Take readings (or at least act like you are taking readings) from the sensor like thing (you forgot the batteries right?)
9. You can also take readings while the vacuum cleaner is on. If pentiums can multitask, so can you! I'm sure the air suction thing will NOT influence the readings of your dead sensor. How stupid of me to ill judge your skills.
10. Oh yeah, forgot to tell you to wear gloves when working in the lab.