The boiler uptakes were protected by a conical mantlet that ranged from in thickness. Sublethal uptakes are drastically reducing marine bird and mammal populations. There was also the challenge of the many exhaust uptakes needed. The resistant-bacteria uptakes and utilizes the DOC, regenerate ammonium, thereby lowering the C&colon;N ratio. They did retain the 1-inch armour plates protecting the boiler uptakes. The funnel uptakes were protected by of armor. The boiler uptakes were protected by armour plates. The middle stack of the three-stack ships was wider due to combining two boiler uptakes. The total amount of JP-5 pumped into the uptakes was approximately 20,000 gallons. She was the first British dreadnought to protect her boiler uptakes with 1-inch armour plates. In order to accomplish this, the funnel uptakes had to be divided. This required the two uptakes being brought together and encased in a forced-air cooling system. Between the main and splinter decks, the boiler uptakes were protected by of armor. The funnel uptakes were provided with of armor.