An environmental control system pack comprising: an air supply manifold; wherein the air supply manifold comprises: an outer duct with an outer duct inlet and an outer duct outlet, wherein the outer duct is configured to transfer air from the outer duct inlet to the outer duct outlet; a first inner duct with a first inner duct inlet and a first inner duct outlet, wherein the first inner duct is partially disposed within and passes through the outer duct, wherein the first inner duct inlet and the first inner duct outlet are disposed outside of the outer duct and wherein the first inner duct is configured to transfer air; and a second inner duct with a second inner duct inlet and a second inner duct outlet, wherein the second inner duct is partially disposed within the outer duct and branches off from the first inner duct, wherein the second inner duct inlet is fluidly connected to the first inner duct, and wherein the second inner duct outlet is disposed outside of the outer duct, and wherein the second inner duct is configured to transfer air; an outflow heat exchanger fluidly connected to the first inner duct outlet; an air cycle machine compressor inlet fluidly connected to the outer duct outlet; a tip turbine fan fluidly connected to the second inner duct outlet; a bleed air source fluidly connected to the first inner duct inlet; and a fresh air source fluidly connected to the outer duct inlet. an air supply manifold; wherein the air supply manifold comprises: an outer duct with an outer duct inlet and an outer duct outlet, wherein the outer duct is configured to transfer air from the outer duct inlet to the outer duct outlet; a first inner duct with a first inner duct inlet and a first inner duct outlet, wherein the first inner duct is partially disposed within and passes through the outer duct, wherein the first inner duct inlet and the first inner duct outlet are disposed outside of the outer duct and wherein the first inner duct is configured to transfer air; and a second inner duct with a second inner duct inlet and a second inner duct outlet, wherein the second inner duct is partially disposed within the outer duct and branches off from the first inner duct, wherein the second inner duct inlet is fluidly connected to the first inner duct, and wherein the second inner duct outlet is disposed outside of the outer duct, and wherein the second inner duct is configured to transfer air; an outflow heat exchanger fluidly connected to the first inner duct outlet; an air cycle machine compressor inlet fluidly connected to the outer duct outlet; a tip turbine fan fluidly connected to the second inner duct outlet; a bleed air source fluidly connected to the first inner duct inlet; and a fresh air source fluidly connected to the outer duct inlet. an outer duct with an outer duct inlet and an outer duct outlet, wherein the outer duct is configured to transfer air from the outer duct inlet to the outer duct outlet; a first inner duct with a first inner duct inlet and a first inner duct outlet, wherein the first inner duct is partially disposed within and passes through the outer duct, wherein the first inner duct inlet and the first inner duct outlet are disposed outside of the outer duct and wherein the first inner duct is configured to transfer air; and a second inner duct with a second inner duct inlet and a second inner duct outlet, wherein the second inner duct is partially disposed within the outer duct and branches off from the first inner duct, wherein the second inner duct inlet is fluidly connected to the first inner duct, and wherein the second inner duct outlet is disposed outside of the outer duct, and wherein the second inner duct is configured to transfer air; an outflow heat exchanger fluidly connected to the first inner duct outlet; an air cycle machine compressor inlet fluidly connected to the outer duct outlet; a tip turbine fan fluidly connected to the second inner duct outlet; a bleed air source fluidly connected to the first inner duct inlet; and a fresh air source fluidly connected to the outer duct inlet.