Within the Red Hat certification program, the RHCA is considered the most complete (and grueling) certification among the seven major Red Hat certifications. In fact, some equate the prestige of the RHCA to that of the Microsoft Certified Master and possibly the CCIE.
A plumbing fixture like a sink can not function properly without a sink vent. When a drain pipe drains it creates a negative pressure in the sink drain; the negative pressure will pull the water out of the p-trap of the sink that's draining and sewer gases can enter your home if a sink vent is not installed.
Any kiln that is located in a room where people are, should definitely be vented to the outside for safety reasons. It is also a good idea in rooms that are attached to living spaces, such as an attached garage. But beyond that, a vent makes it much easier to fire the kiln and provides better results.